Silica-bonded N-propyldiethylenetriamine (7) is employed as a recyclable heterogeneous solid base catalyst for the synthesis of 2-amino-3,5-dicarbonitrile-6-thiopyridines through pseudo four-component condensation reaction between... more
Silica-bonded N-propyldiethylenetriamine (7) is employed as a recyclable heterogeneous solid base catalyst for the synthesis of 2-amino-3,5-dicarbonitrile-6-thiopyridines through pseudo four-component condensation reaction between aromatic aldehydes, malononitrile, and 2-amino-thiophenol in refluxing ethanol. Silica-bonded N-propyldiethylenetriamine showed much the same efficiency when used in consecutive reaction runs.
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Silica-bonded n-propyldiethylenetriamine sulfamic acid (SBPDSA) was found as an efficient solid acid for the synthesis of coumarins. Coumarin derivatives were obtained via the Pechmann condensation reaction of phenols and β-keto-esters at... more
Silica-bonded n-propyldiethylenetriamine sulfamic acid (SBPDSA) was found as an efficient solid acid for the synthesis of coumarins. Coumarin derivatives were obtained via the Pechmann condensation reaction of phenols and β-keto-esters at 80 o C under solvent-free conditions. Also, biscoumarins were obtained via the condensation of aldehydes and 4-hydroxycoumarin in water at reflux conditions. The heterogeneous solid acid showed much the same efficiency when used in consecutive reaction runs.
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Silica-bonded N-propyldiethylenetriamine sulfamic acid (SPDTSA) is employed as a recyclable heterogeneous solid acid catalyst for the synthesis of benzopyrano[2,3-d]pyrimidines through one-pot condensation reaction of salicylaldehydes,... more
Silica-bonded N-propyldiethylenetriamine sulfamic acid (SPDTSA) is employed as a recyclable heterogeneous solid acid catalyst for the synthesis of benzopyrano[2,3-d]pyrimidines through one-pot condensation reaction of salicylaldehydes, malononitrile and secondary amines at room temperature under solvent-free conditions. SPDTSA showed much the same efficiency when used in consecutive reaction runs.
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A sequential process strategy was introduced for the synthesis of 2,3,4,5-tetrasubstituted pyrroles by the formation of benzoin from the corresponding aromatic aldehyde and followed by condensation reaction with 1,3-dicarbonyl compounds... more
A sequential process strategy was introduced for the synthesis of 2,3,4,5-tetrasubstituted pyrroles by the formation of benzoin from the corresponding aromatic aldehyde and followed by condensation reaction with 1,3-dicarbonyl compounds and ammonium acetate in the presence of diethylene glycol-bis(3-methylimidazolium) dihydroxide as catalyst in refluxing ethanol. The recycled catalyst could be reused four times without appreciable loss in the catalytic activity.
Silica-grafted n-propyl-diaza-15-crown-5 (SGPDC) with immobilized palladium nanoparticles was found as an efficient heterogeneous catalytic system for the Heck and Suzuki coupling reactions and satisfied results were obtained. Different... more
Silica-grafted n-propyl-diaza-15-crown-5 (SGPDC) with immobilized palladium nanoparticles was found as an efficient heterogeneous catalytic system for the Heck and Suzuki coupling reactions and satisfied results were obtained. Different derivatives of aryl halides and alkenes under the Heck reaction were converted to the corresponding products with good efficiency. The presence of electron-donating groups on the aryl moiety of aryl halide derivatives retarded the reaction and led to the drop of yields. In contrast, higher efficiency was observed when electron-withdrawing groups were accommodated on the aryl halide. As well as, a variety of bi-phenyl derivatives were well synthesized by the coupling reaction between aryl halides and aryl boronic acids derivatives via the Suzuki reaction. Reusability of the catalyst was examined in both Heck and Suzuki reactions under optimized conditions. The catalyst could be recycled several times without any treatment in its catalytic activity. Th...
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Ligand-free and base-free conditions were used for the preparation of aryl azides using the cross-coupling of sodium azide and aryl halides catalysed by Cu2O–CuO–Cu–C.
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ABSTRACT An efficient heterogeneous Pd catalytic system has been developed, based on immobilization of Pd nanoparticles (PNPs) on a silica-bonded N-propylpiperazine (SBNPP) substrate. The SBNPP substrate effectively stabilizes the PNPs... more
ABSTRACT An efficient heterogeneous Pd catalytic system has been developed, based on immobilization of Pd nanoparticles (PNPs) on a silica-bonded N-propylpiperazine (SBNPP) substrate. The SBNPP substrate effectively stabilizes the PNPs and improves their stability against aggregation. The catalytic activity of this catalyst was investigated in the cyanation of aryl halides with K-4[Fe(CN)(6)] as the cyanide source. The catalyst could be recycled several times without appreciable loss of catalytic activity.
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... Mohammad Ali Zolfigol,a Khodabakhsh Niknam*,b and Fariba Nazaric aDepartment of Chemistry, College of Science, Bu-Ali Sina University ... powerful carcinogens, since most compounds of these types have been shown to possess high... more
... Mohammad Ali Zolfigol,a Khodabakhsh Niknam*,b and Fariba Nazaric aDepartment of Chemistry, College of Science, Bu-Ali Sina University ... powerful carcinogens, since most compounds of these types have been shown to possess high activity in experimental ani-mals.23 ...
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... Metal Hydrogen Sulfates M(HSO 4 ) n : As Efficient Catalysts for the Synthesis of Quinoxalines in EtOH at Room Temperature. Auteur(s) / Author(s). NIKNAM Khodabakhsh ; MOHAMMADALI ZOLFIGOL ; TAVAKOLI Ziba ; HEYDARI Zahra ; Résumé /... more
... Metal Hydrogen Sulfates M(HSO 4 ) n : As Efficient Catalysts for the Synthesis of Quinoxalines in EtOH at Room Temperature. Auteur(s) / Author(s). NIKNAM Khodabakhsh ; MOHAMMADALI ZOLFIGOL ; TAVAKOLI Ziba ; HEYDARI Zahra ; Résumé / Abstract. ...
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... Mohammad Ali Zolfigol,a,* Ezat Ghaemi,a Elaheh Madrakiana and Khodabakhsh Niknamb aFaculty of Chemistry, Bu-Ali Sina University, Hamedan, 6517838683, Iran bChemistry Department, Faculty of Sciences, Persian Gulf ... c) Firouzabadi,... more
... Mohammad Ali Zolfigol,a,* Ezat Ghaemi,a Elaheh Madrakiana and Khodabakhsh Niknamb aFaculty of Chemistry, Bu-Ali Sina University, Hamedan, 6517838683, Iran bChemistry Department, Faculty of Sciences, Persian Gulf ... c) Firouzabadi, H.; Iranpoor, N.; Amani, K. Synthesis ...
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Cited By (since 1996): 20, Export Date: 3 September 2012, Source: Scopus
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The proposed research describes the application of cloud point extraction (CPE) methodology for the preconcentration of ultra-trace amounts of Cu 2+, Co 2+, Zn 2+, and Mn 2+ ions prior to their determination. In this technique, non-ionic... more
The proposed research describes the application of cloud point extraction (CPE) methodology for the preconcentration of ultra-trace amounts of Cu 2+, Co 2+, Zn 2+, and Mn 2+ ions prior to their determination. In this technique, non-ionic surfactant Triton X-114 in the presence of (2-(pyridin-2-yl)-1H-benzo[d]imidazole) (PBI) as chelating agent has been applied, and influence of variables that affect the CPE efficiency and FAAS signal were optimized. Carrying out pre-concentration with 15 ml sample solution allowed to achieve a pre-concentration factor of 30, and enhancement factors of 33, 38, 28 and 25 for Cu 2+, Zn 2+, Co 2+ and Mn 2+ ions, respectively. The calibration graph using the pre-concentration system was linear in the range of 0.01-0.25 μg ml -1 for Cu 2+ions, 0.01-0.21 μg ml -1 for Zn 2+, 0.015-0.28 μg ml -1 for Co 2+ and 0.015-0.31 μg ml -1for Mn 2+ ions, with correlation coefficients of 0.998-0.999. The lower limit of detection (3s) obtained under optimal conditions wa...
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AbstractA convenient method for the synthesis of quinoxalines catalysed by metal hydrogen sulfates by the reaction of 1,2‐diamino compounds and 1,2‐dicarbonyl compounds in ethanol as solvent at room temperature is reported.
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... Niknam,a,* Mohammad Ali Zolfigol,b Dariush Saberia and Hajar Molaeea aDepartment of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran bFaculty of Chemistry, Bu-Ali Sina University, PO ... (a) Niknam, K.;... more
... Niknam,a,* Mohammad Ali Zolfigol,b Dariush Saberia and Hajar Molaeea aDepartment of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran bFaculty of Chemistry, Bu-Ali Sina University, PO ... (a) Niknam, K.; Zolfigol, M.-A.; Sadabadi, T.; Nejati, A. J. Iran. ...
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In this paper single-layer OLED has been fabricated using nearinfra organic material as an emission layer. We use thermal evaporation technique under vacuum condition. The characteristics of this diode is considered and investigated with... more
In this paper single-layer OLED has been fabricated using nearinfra organic material as an emission layer. We use thermal evaporation technique under vacuum condition. The characteristics of this diode is considered and investigated with different thicknesses. The electroluminescent spectrums of this material have
ABSTRACT A simple and efficient procedure for the preparation of silica-bound N-propyl triethylenetetramine sulfamic acid (SBPTETSA) by the reaction of silica-bound N-propyl triethylenetetramine (SBPTET) with chlorosulfonic acid in... more
ABSTRACT A simple and efficient procedure for the preparation of silica-bound N-propyl triethylenetetramine sulfamic acid (SBPTETSA) by the reaction of silica-bound N-propyl triethylenetetramine (SBPTET) with chlorosulfonic acid in chloroform is described. Silica-bound N-propyl triethylenetetramine sulfamic acid was employed as a recyclable catalyst for the synthesis of 2-amino-4,6-diarylnicotinonitriles from the multi-component reaction of an acetophenone derivative, an aromatic aldehyde, malononitrile, and ammonium acetate under solvent-free conditions at 100°C. The heterogeneous catalyst was recycled for five consecutive runs in the optimized multi-component reaction of 4-chloroacetophenone, 4-chloroenzaldehyde, malononitrile, and ammonium acetate without significant loses to its catalytic activity.
Bull. Korean Chem. Soc. 2002, Vol. 23, No. 11 1611 ... Halogenated Cleavage of Epoxides into Halohydrins in the Presence of a Series ... Hashem Sharghi,* Zahra Paziraee, and Khodabakhsh Niknam ... Department of Chemistry, Faculty of... more
Bull. Korean Chem. Soc. 2002, Vol. 23, No. 11 1611 ... Halogenated Cleavage of Epoxides into Halohydrins in the Presence of a Series ... Hashem Sharghi,* Zahra Paziraee, and Khodabakhsh Niknam ... Department of Chemistry, Faculty of Science, Shiraz University, Shiraz ...
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... Mohammad Ali Zolfigol,a* Gholamabbas Chehardoli,b Mina Dehghanian,a Khodabakhsh Niknam,c* Farhad Shirinid and Ahmad Khoramabadi-Zada aFaculty of ... 9. Zolfigol, M.-A.; Niknam, K.; Bagherzadeh, M.; Choghamarani, A.-G.; Koukabi, N.;... more
... Mohammad Ali Zolfigol,a* Gholamabbas Chehardoli,b Mina Dehghanian,a Khodabakhsh Niknam,c* Farhad Shirinid and Ahmad Khoramabadi-Zada aFaculty of ... 9. Zolfigol, M.-A.; Niknam, K.; Bagherzadeh, M.; Choghamarani, A.-G.; Koukabi, N.; Hajjami, M.; Kolvari, E. J. Chin. ...
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Khodabakhsh Niknam,a* Mohammad Ali Zolfigol,b* Mohsen Shayeghb and Reza Zareb aChemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, Zip Code 75169, Iran bFaculty of Chemistry, Bu-Ali Sina University, Hamedan, Zip... more
Khodabakhsh Niknam,a* Mohammad Ali Zolfigol,b* Mohsen Shayeghb and Reza Zareb aChemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr, Zip Code 75169, Iran bFaculty of Chemistry, Bu-Ali Sina University, Hamedan, Zip Code 65174, Post Box No. 4135, Iran
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... Mehrorang Ghaedi,a* Khodabakhsh Niknam,b Ebrahim Niknamb and Mustafa Soylakc aChemistry Department, Yasouj University, Yasouj 75914-353 ... element concentrations in biological materials, partic-ularly biological fluids, might be... more
... Mehrorang Ghaedi,a* Khodabakhsh Niknam,b Ebrahim Niknamb and Mustafa Soylakc aChemistry Department, Yasouj University, Yasouj 75914-353 ... element concentrations in biological materials, partic-ularly biological fluids, might be considered a difficult ana-lytical task ...
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... 2005, 26, 145. 20. Shirini, F.; Lakouraj, MM; Mohammadpoor-Bltork, I.; Asadi, D. Synth. Commun. 2003, 33, 1833. 21. ... 25. (a) Zolfigol, MA Tetrahedron 2001, 57, 9509. (b) Zolfigol, MA; Shirin, F.; Ghorbani Choghamarani, A.;... more
... 2005, 26, 145. 20. Shirini, F.; Lakouraj, MM; Mohammadpoor-Bltork, I.; Asadi, D. Synth. Commun. 2003, 33, 1833. 21. ... 25. (a) Zolfigol, MA Tetrahedron 2001, 57, 9509. (b) Zolfigol, MA; Shirin, F.; Ghorbani Choghamarani, A.; Mohammadpoor-Baltork, I. Green Chem. 2002, 4, 562. ...
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ABSTRACT 3-Chloropropylsilica was reacted with Kriptofix 21 or 22 in the presence of triethylamine to form N-propylsilica Kryptofix 21 and Kriptofix 22. Then N2O4 was added to each of these polymers to chemisorb onto cavity of aza-crown... more
ABSTRACT 3-Chloropropylsilica was reacted with Kriptofix 21 or 22 in the presence of triethylamine to form N-propylsilica Kryptofix 21 and Kriptofix 22. Then N2O4 was added to each of these polymers to chemisorb onto cavity of aza-crown ethers. These functionalized polymers were applied for the fast and simple oxidation of urazoles and 1,4-dihydropyridines, respectively.
A cloud point extraction (CPE) procedure was presented for the preconcentration of silver, zinc, and lead ions in various samples. The complexes of these metal ions with 2-(((1H-benzo[d]imidazol-2-yl)methoxy)methyl)-1H-benzo[d]imidazole... more
A cloud point extraction (CPE) procedure was presented for the preconcentration of silver, zinc, and lead ions in various samples. The complexes of these metal ions with 2-(((1H-benzo[d]imidazol-2-yl)methoxy)methyl)-1H-benzo[d]imidazole (BIMMBI) are quantitatively extracted into the Triton X-114-rich phase after centrifugation. A solution of 1.0 M HNO3 in methanol was added to the surfactant-rich phase as the effective eluant before analysis by flame atomic absorption spectrometry. The influence of effective parameters such as the concentrations of BIMMBI, Triton X-114, and HNO3, pH, bath temperature, centrifuge rate, and time on method sensitivity and efficiency was optimized. Detection limits of 2.8, 1.7, and 1.1 ng/mL for Pb2+, Ag+, and Zn2+, respectively, along with a preconcentration factor of 30 and enrichment factors of 33, 48, and 53 for Pb2+, Ag+, and Zn2+, respectively, were obtained. The present CPE method is suitable for accurate and precise determination of trace amount...
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In this research at first palladium nanoparticle attached to a new chemically bonded silica gel has been synthesized and has been characterized with different techniques such as X-ray diffraction (XRD), fourier transform infrared (FT-IR),... more
In this research at first palladium nanoparticle attached to a new chemically bonded silica gel has been synthesized and has been characterized with different techniques such as X-ray diffraction (XRD), fourier transform infrared (FT-IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Then, this new sorbent (chemically modified silica gel with N-propylmorpholine (PNP-SBNPM)) was efficiently used for preconcentration of some metal ions in various food samples. The influence of effective variables including mass of sorbent, flow rate, pH of sample solutions and condition of eluent such as volume, type and concentration on the recoveries of understudy metal ions were investigated. Following the optimization of variables, the interfering effects of some foreign ions on the preconcentration and determination of the investigated metal ions described. At optimum values of variables, all investigated metal ions were efficiently recovered with efficiency more...
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... Mohammad Ali Zolfigol,1 Elaheh Madrakian,1 Ezat Ghaemi,1 and Khodabakhsh Niknam2 1Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran ... 2003, 44, 8781; (c) Firouzabadi, H.; Iranpoor, N.; Amani, K. Solvent-free and selective... more
... Mohammad Ali Zolfigol,1 Elaheh Madrakian,1 Ezat Ghaemi,1 and Khodabakhsh Niknam2 1Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran ... 2003, 44, 8781; (c) Firouzabadi, H.; Iranpoor, N.; Amani, K. Solvent-free and selective oxidation of hydroxy groups to their ...
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Several new 1,5-diaryl-3-(arylamino)-1H-pyrrol-2(5H)-ones were synthesized via the three-component condensation reaction of aldehydes, aromatic amines, and ethyl pyruvate under catalyst-free and solvent-free conditions. Also,... more
Several new 1,5-diaryl-3-(arylamino)-1H-pyrrol-2(5H)-ones were synthesized via the three-component condensation reaction of aldehydes, aromatic amines, and ethyl pyruvate under catalyst-free and solvent-free conditions. Also, 5-(4-hydroxyl-3-nitrophenyl)-1-(4-methoxy-phenyl)-3-(4-methoxyphenylamino)-1,5-dihydro-pyrrol-2-one was synthesized using oxime instead of aldehyde. The eco-friendly, simple procedure, green procedure, catalyst-free and solvent-free conditions, short reaction times, and high yields of the products are the advantages of this method.
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ABSTRACT A highly selective synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles from the reaction of o-phenylenediamine and aromatic aldehydes in the presence of silica-bonded propyl-S-sulfonic acid (SBSSA) at 80°C in water in good to... more
ABSTRACT A highly selective synthesis of 2-aryl-1-arylmethyl-1H-1,3-benzimidazoles from the reaction of o-phenylenediamine and aromatic aldehydes in the presence of silica-bonded propyl-S-sulfonic acid (SBSSA) at 80°C in water in good to excellent yields was developed.
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Aromatic nitro compounds can be conveniently reduced to the corresponding primary amines in the presence of S 8 under solvent-free conditions in excellent yields. Alumina supported NaOH catalyses this transformation. Chemoselectivity was... more
Aromatic nitro compounds can be conveniently reduced to the corresponding primary amines in the presence of S 8 under solvent-free conditions in excellent yields. Alumina supported NaOH catalyses this transformation. Chemoselectivity was observed in the reduction of the nitro ...
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A sensitive and selective solid phase extraction procedure for the determination of traces of Cu(II), Zn(II), Pb(II) and Fe(III) has been developed. An alumina-sodium dodecyl sulfate (SDS) coated on with meso-phenyl bis(indolyl) methane... more
A sensitive and selective solid phase extraction procedure for the determination of traces of Cu(II), Zn(II), Pb(II) and Fe(III) has been developed. An alumina-sodium dodecyl sulfate (SDS) coated on with meso-phenyl bis(indolyl) methane (MPBIM) was used for preconcentration and determination of Cu(II), Zn(II), Pb(II) and Fe(III) ions by flame atomic absorption spectrometry. The analyte ions were adsorbed quantitatively on adsorbent
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Preparation of di and tri(bis(indolyl) methanes) from di and trialdehydes and indoles in the presence of silica sulfuric acid was described. Reactions proceeded in good to excellent yields in acetonitrile as solvent at room temperature.
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Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane (BHIS) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of silver. The method is based on the extraction... more
Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane (BHIS) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of silver. The method is based on the extraction of silver at pH 8.0 by using non-ionic surfactant T-X114 and bis((1H-benzo[d]imidazol-2yl)methyl)sulfane as a chelating agent. The adopted concentrations for BHIS, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were optimized. Detection limits (3SDb/m) of 1.7 along with enrichment factor of 39 for silver ion was achieved. The high efficiency of cloud point extraction to carry out the determination of analytes in complex matrices was demonstrated. The proposed method was successfully applied to the ultra-trace determination of silver in real samples.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select... more
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT Silica-bonded N-propyl diethylenetriamine sulfamic acid (SBPDSA) is employed as a recyclable catalyst to synthesize a-aminonitriles. These syntheses involved one-pot condensation of an aldehyde, an amine, and trimethylsilyl... more
ABSTRACT Silica-bonded N-propyl diethylenetriamine sulfamic acid (SBPDSA) is employed as a recyclable catalyst to synthesize a-aminonitriles. These syntheses involved one-pot condensation of an aldehyde, an amine, and trimethylsilyl cyanide under mild reaction conditions at room temperature. SBPDSA was recycled seven times in the condensation of benzaldehyde, aniline, and trimethylsilyl cyanide without reduction of its catalytic activity.
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Page 1. Fabrication of a Near Infrared OLED Mohammad taghi sharbati 1, Farhad panahi 3 Alireza gharavi 1, Farzin emami 2, Khodabakhsh niknam3 1 Photonic Lab, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran ...
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A combination of alumina/methanesulfonic acid (AMA) and sodium nitrite was used as an effective nitrosating agent for the nitrosation of secondary amines under mild and heterogeneous conditions in good to excellent yields.
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... Zarrinmayeh , H. ; Nunes , AM ; Ornstein , PL ; Zimmerman , DA ; Gackenheimer , SL ; Bruns , RF ; Hipskind , PA ; Britton , TC ; Cantrell , BE ; Gehlert , DR ... White , AW ; Almassy , R. ; Calvert , AH ; Curtin , NJ ; Griffin , RJ ;... more
... Zarrinmayeh , H. ; Nunes , AM ; Ornstein , PL ; Zimmerman , DA ; Gackenheimer , SL ; Bruns , RF ; Hipskind , PA ; Britton , TC ; Cantrell , BE ; Gehlert , DR ... White , AW ; Almassy , R. ; Calvert , AH ; Curtin , NJ ; Griffin , RJ ; Hostomsky , Z. ; Maegley , K. ; Newell , DR ; Srinivasan , S ...
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Abstract: A highly selective, rapid and economical differential pulsepolarographic method has been developed for the determination of trace amountsof cadmium and lead present together in various standard alloys and biologicalsamples after... more
Abstract: A highly selective, rapid and economical differential pulsepolarographic method has been developed for the determination of trace amountsof cadmium and lead present together in various standard alloys and biologicalsamples after adsorption of their 1-(2-pyridylazo)- ...
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Cloud point methodology was successfully employed for preconcentration of trace copper, zinc, iron, and nickel prior to their determination by flame atomic absorption spectrometry (FAAS). The metals react with 2-phenyl-1H-benzo[d]... more
Cloud point methodology was successfully employed for preconcentration of trace copper, zinc, iron, and nickel prior to their determination by flame atomic absorption spectrometry (FAAS). The metals react with 2-phenyl-1H-benzo[d] imidazole (PHBI) in a surfactant Triton X-114 medium. The effects of analytical parameters including pH, amounts of reagents etc. were investigated on the recoveries of analytes. No influences were observed from the matrix ions. The detection limits (3SDb/m) of 1.8, 2.8, 1.4, and 2.1 ng mL for Cu, Fe, Zn, and Ni, respectively. The method was applied to metal determination in various real samples. The validation of the procedure was carried out by analysis of a certified reference biological material, BCR 185 R liver samples.
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Silver ion-selective electrodes based on methyl-2-pyridyl ketone oxime (MPKO), phenyl-2-pyridyl ketone oxime (PPKO) and bis[2-(o-carboxythiophenoxy)methyl]-4-bromo-1-methoxybenzene (CMBMB) carriers have been developed. The membrane... more
Silver ion-selective electrodes based on methyl-2-pyridyl ketone oxime (MPKO), phenyl-2-pyridyl ketone oxime (PPKO) and bis[2-(o-carboxythiophenoxy)methyl]-4-bromo-1-methoxybenzene (CMBMB) carriers have been developed. The membrane solutions containing PVC, ...
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The complexation of synthesized diamine 2,6-bis[2-(o-aminophenoxy)methyl]-4-bromo-1-methoxybenzene with different ions was studied conductometrically. The best interaction was observed between the diamine and Be 2+ ion and the formation... more
The complexation of synthesized diamine 2,6-bis[2-(o-aminophenoxy)methyl]-4-bromo-1-methoxybenzene with different ions was studied conductometrically. The best interaction was observed between the diamine and Be 2+ ion and the formation constant of the resulting complex was ...
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... Eur. J. Org. Chem. , : 1584 [CrossRef], [Web of Science ®] View all references HClO 4 -SiO 2 , 25 26. Kamble, VT, Kadam, KR, Joshi, NS and Muley, DB 2007. Catal. Commun. ... Sirinivasa, A., Nandeshwarappa, BP, Kiran, BM and Mahadevan,... more
... Eur. J. Org. Chem. , : 1584 [CrossRef], [Web of Science ®] View all references HClO 4 -SiO 2 , 25 26. Kamble, VT, Kadam, KR, Joshi, NS and Muley, DB 2007. Catal. Commun. ... Sirinivasa, A., Nandeshwarappa, BP, Kiran, BM and Mahadevan, KM 2007. ...
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ABSTRACT Silica-bonded N-propyltriethylenetetramine was prepared via the reaction between 3-silicapropyl chloride and triethylenetetramine. This heterogeneous solid base was used as a catalyst for the synthesis of... more
ABSTRACT Silica-bonded N-propyltriethylenetetramine was prepared via the reaction between 3-silicapropyl chloride and triethylenetetramine. This heterogeneous solid base was used as a catalyst for the synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) by a one-pot condensation of aromatic aldehydes with 3-methyl-1-phenyl-5-pyrazolone in 72–93 % yields. The catalyst could be recycled several times without any additional treatment. Graphical abstract
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... 37 (1996) 4467; f) JS Yadav, BVS Reddy, CVSR Murthy, GM Kumar, C. Madan, Synthesis (2001) 783. [15] MA Zolfigol, P. Salehi, M. Shiri, Phosphorus, Sulfur Silicon Relat. Elem. 179 (2004) 2273. [16] a) M. Karthik, AK Tripathi, NM Gupta,... more
... 37 (1996) 4467; f) JS Yadav, BVS Reddy, CVSR Murthy, GM Kumar, C. Madan, Synthesis (2001) 783. [15] MA Zolfigol, P. Salehi, M. Shiri, Phosphorus, Sulfur Silicon Relat. Elem. 179 (2004) 2273. [16] a) M. Karthik, AK Tripathi, NM Gupta, M. Palanichamy, V. Murugesan, Catal. ...
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ABSTRACT Reaction of 18-crown-6 with KI in ethanol solution followed by addition of iodine (I2) afforded a unique triiodide salt with a nanotube-like structure ({[K.18-Crown-6]I3}n). It is shown that this reagent may be used for the... more
ABSTRACT Reaction of 18-crown-6 with KI in ethanol solution followed by addition of iodine (I2) afforded a unique triiodide salt with a nanotube-like structure ({[K.18-Crown-6]I3}n). It is shown that this reagent may be used for the chemoselective trimethylsilylation of alcohols. The synthesis of the crystalline reagent is a good example of crystal engineering. Reagent was recycled and reused.
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... 60 (2007) 109. [20] K. Amani, F. Maleki, J. Iran. Chem. Soc. 4 (2007) 238. [21] KK Laali, VJ Gettwert, J. Org. Chem. 66 (2001) 35. [22] F. Currie, K. Holmberg, G. Westman, Colloids Surf. A 182 (2001) 321. [23] V. Singh, S. Kaur, V.... more
... 60 (2007) 109. [20] K. Amani, F. Maleki, J. Iran. Chem. Soc. 4 (2007) 238. [21] KK Laali, VJ Gettwert, J. Org. Chem. 66 (2001) 35. [22] F. Currie, K. Holmberg, G. Westman, Colloids Surf. A 182 (2001) 321. [23] V. Singh, S. Kaur, V. Sapehiyia, J. Singh, GL Kad, Catal. Commun. ...
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An efficient, simple and clean solvent-free procedure for the preparation of N-sulfonyl imines is described. The reaction of sulfonamides with different aromatic aldehydes in the presence of silica-phosphinoxide (Silphox) [POCl3−n(SiO2)n]... more
An efficient, simple and clean solvent-free procedure for the preparation of N-sulfonyl imines is described. The reaction of sulfonamides with different aromatic aldehydes in the presence of silica-phosphinoxide (Silphox) [POCl3−n(SiO2)n] as a new and heterogeneous reagent affords the title compounds in good to high yields.
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The regioselective ring-opening reactions of some epoxides with ammonium thiocyanate in the presence of a series of new phenol-containing macrocyclic diamides and also dibenzo-18-crown-6-, 18-crown-6-, benzo-15-crown-5-, and... more
The regioselective ring-opening reactions of some epoxides with ammonium thiocyanate in the presence of a series of new phenol-containing macrocyclic diamides and also dibenzo-18-crown-6-, 18-crown-6-, benzo-15-crown-5-, and pyridine-containing macrocyclic diamide have been studied. The epoxides were subject to cleavage by NH(4)SCN in the presence of these catalysts under mild reaction conditions in various aprotic solvents. In this study, reagents and conditions have been discovered with which the individual beta-hydroxy thiocyanates can be synthesized in high yield and with more than 90% regioselectivity. The results can be discussed in terms of a four-step mechanism: (1) formation of complex between catalyst and NH(4)SCN, (2) release of SCN(-) nucleophile from the complex, (3) reaction of the active nucleophile at the less sterically hindered site in the epoxide, and (4) regeneration of catalyst. The major advantages of this method are as follows: (1) high regioselectivity, (2) simple regeneration of catalyst, (3) its reuse through several cycles without a decrease in activity, and (4) ease of workup of the reaction.
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The regioselective ring opening halogenation of some epoxides using elemental iodine and bromine in the presence of a series of new synthetic macrocycle diamides and also dibenzo-18-crown -6, 18-crown-6, and aza-18-crown-6 has been... more
The regioselective ring opening halogenation of some epoxides using elemental iodine and bromine in the presence of a series of new synthetic macrocycle diamides and also dibenzo-18-crown -6, 18-crown-6, and aza-18-crown-6 has been studied. The epoxides ...
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A new and efficient solid phase extraction method is described for the preconcentration of trace heavy metal ions. The method is based on the adsorption of Fe(3+), Cu(2+) and Zn(2+) on 2-phenyl-1H-benzo[d] imidazole (PHBI) loaded on... more
A new and efficient solid phase extraction method is described for the preconcentration of trace heavy metal ions. The method is based on the adsorption of Fe(3+), Cu(2+) and Zn(2+) on 2-phenyl-1H-benzo[d] imidazole (PHBI) loaded on Triton X-100-coated polyvinyl chloride (PVC). The influences of the analytical parameters including pH and sample volume were investigated. Common coexisting ions did not interfere on the separation and determination of analytes under study. The adsorbed analytes were desorbed by using 5 mL of 4 mol L(-1) nitric acid. The preconcentration factor is 90. The detection limits (3 sigma) were in the range of 0.95-1 microg L(-1). The sorbent exhibited excellent stability and its sorption capacity under optimum conditions has been found to be more than 2.7 mg of ions per gram of sorbent. The recoveries of analytes were generally higher than 95%. The relative standard deviations (R.S.D.s) were generally lower than 4%. The method has been successfully applied to some real samples.
Research Interests: Engineering, Trace Metals, Heavy metals, Solid Phase Extraction, Heavy Metal, and 11 moreHazardous Materials, Atomic Absorption Spectrometry, Hazardous, Reproducibility of Results, Surface Active Agents, NITRIC ACID, Benzimidazoles, Polyvinyl Chloride, Hydrogen-Ion Concentration, Ions, and Relative Standard Deviation
A cloud point extraction procedure for the preconcentration of Pb2+ in various samples following complexation with 2,2-(1E,1′E)-1,1′-(2,2′-azanediylbis(ethane-2,1-diyl)bis(azan-1-yl-1-ylidene)) bis(ethan-1-yl-1-ylidene)diphenol in Triton... more
A cloud point extraction procedure for the preconcentration of Pb2+ in various samples following complexation with 2,2-(1E,1′E)-1,1′-(2,2′-azanediylbis(ethane-2,1-diyl)bis(azan-1-yl-1-ylidene)) bis(ethan-1-yl-1-ylidene)diphenol in Triton X-114 after centrifugation is reported. A 0.5 mL portion of methanol acidified with 1.0 M HNO3 was added to the surfactant-rich phase prior to analysis by flame atomic absorption spectrometry. The influence of analytical parameters—including pH, concentrations of ligand, Triton X-114, and HNO3, bath temperature, heating time, and centrifugation rate and time—were optimized, and the effect of the matrix ions on the recovery of Pb2+ was investigated. An LOD of 1.9 ng/mL along with a preconcentration factor of 50 with RSD of 1.0% for Pb2+ were achieved. The proposed procedure was applied to the analysis of various real samples.
Research Interests: Engineering, Analytical Chemistry, Food Analysis, Copper, Calibration, and 15 moreAnimals, Drinking Water, Cadmium, CHEMICAL SCIENCES, Buffers, Centrifugation, Enrichment factor, Food Contamination, Atomic Absorption, Analytical Methods, Environmental Pollutants, Flame, Extract, Aqueous Solution, and Flame Atomic Absorption Spectrometry
An efficient enrichment procedure based on the combination of flame atomic absorption spectrometry (FAAS) and flotation for determination of Cd2+, Ag+ and Zn2+ ions in various biological samples using new collector is studied. The... more
An efficient enrichment procedure based on the combination of flame atomic absorption spectrometry (FAAS) and flotation for determination of Cd2+, Ag+ and Zn2+ ions in various biological samples using new collector is studied. The influence of pH, amount of 2-(((1H-benzo[d]imidazol-2-yl)methoxy)methyl)-1H-benzo[d]imidazole (HBIMMHBI) as collector, sample matrix, type and amount of eluting agent, type and amount of surfactant as floating agent, ionic strength and air flow rates on the extraction efficiency were evaluated and optimized. It is ascertained that under study metal ions is preconcentrated simultaneously from matrix in the presence of 0.005 M HBIMMHBI, 0.085% (w/v) of SDS form 750 mL at pH 6.5. The floated complexes metal ions eluted quantitatively with 6 mL of 1.0 M HNO3 in methanol lead to achieve preconcentration factor of 125. The detection limits for analyte ions were in the range of 1.3–2.4 ng mL-1, with recoveries more than 95% and relative SD lower than 4%.
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ABSTRACT
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... Solid-phase extraction (SPE) technique has increas-ingly become popular in comparison with the more tra-ditional liquid-liquid extraction methods because of its several major advantages such as: (i) simplicity to oper-ate; (ii) high... more
... Solid-phase extraction (SPE) technique has increas-ingly become popular in comparison with the more tra-ditional liquid-liquid extraction methods because of its several major advantages such as: (i) simplicity to oper-ate; (ii) high preconcentration factor; (iii) rapid phase ...
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... 1,8-Dioxo-octahydroxanthenes Khodabakhsh Niknam* and Maryam Damya Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran ... Commun. 2008, 38, 2958-2966. 28. Tajik, H.; Niknam, K.; Parsa, F. J. Iran.... more
... 1,8-Dioxo-octahydroxanthenes Khodabakhsh Niknam* and Maryam Damya Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran ... Commun. 2008, 38, 2958-2966. 28. Tajik, H.; Niknam, K.; Parsa, F. J. Iran. Chem. Soc. 2009, 6, 159-164. 29. ...
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... Niknam Corresponding Author Contact Information , a , E-mail The Corresponding Author , E-mail The Corresponding Author , Alireza Hasaninejad a and Madihe Arman a. a Department of Chemistry, Faculty of Sciences, Persian Gulf... more
... Niknam Corresponding Author Contact Information , a , E-mail The Corresponding Author , E-mail The Corresponding Author , Alireza Hasaninejad a and Madihe Arman a. a Department of Chemistry, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Iran. ...
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... 3． Vinod T. Kamble, Bhaskar S. Davane, Sanjay A. Chavan, Dnyanoba B. Muley, Sandeep T. Atkore.Imino Diels-Alder reactions: One ... 6． Sandip A. Sadaphal, Amol H. Kategaonkar, Vilas B. Labade, Murlidhar S. Shingare*.Synthesis of... more
... 3． Vinod T. Kamble, Bhaskar S. Davane, Sanjay A. Chavan, Dnyanoba B. Muley, Sandeep T. Atkore.Imino Diels-Alder reactions: One ... 6． Sandip A. Sadaphal, Amol H. Kategaonkar, Vilas B. Labade, Murlidhar S. Shingare*.Synthesis of bis(indolyl) methanes using aluminium ...
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A cloud point extraction procedure for the preconcentration of copper, nickel, iron and zinc ions in various samples has been described. Analyte ions in aqueous phase are complexed with 3-((indolin-3-yl)(phenyl)methyl)indoline (IYPMI) and... more
A cloud point extraction procedure for the preconcentration of copper, nickel, iron and zinc ions in various samples has been described. Analyte ions in aqueous phase are complexed with 3-((indolin-3-yl)(phenyl)methyl)indoline (IYPMI) and following centrifugation quantitatively extracted to the aqueous phase rich in Triton X-114. The surfactant-rich phase was dissolved in 2.0 mol L−1 HNO3 in methanol prior to metal content determination by flame atomic absorption spectrometry (FAAS). The effects of some parameters including, the concentrations of IYPMI, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were investigated on the recoveries of analyte ions. At optimum conditions, the detection limits of (3 SDb m−1) of 1.6, 2.8, 2.1 and 1.1 ng mL−1 for Cu2+, Fe3+, Ni2+ and Zn2+ along with preconcentration factors of 30 and enrichment factor of 48, 39, 34 and 52 for Cu2+, Ni2+, Fe3+ and Zn2+ respectively, were obtained. The proposed cloud point extraction has been success...
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... b Department of Chemistry, Yasouj University, Yasouj 75914-353, Iran. c College of Chemistry, Bu-Ali Sina University, Hamadan 65174, Iran. Received 27 April 2006; revised 6 December 2006; accepted 7 December 2006. Available online 16... more
... b Department of Chemistry, Yasouj University, Yasouj 75914-353, Iran. c College of Chemistry, Bu-Ali Sina University, Hamadan 65174, Iran. Received 27 April 2006; revised 6 December 2006; accepted 7 December 2006. Available online 16 December 2006. Abstract. ...
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... Synth. Commun., 29 (1999), p. 541. [15] B. Karimi and B. Golshani. J. Org. Chem., 65 (2000), p. 7228. [16] N. Azizi and MR Saidi. Organometallics, 23 (2004), p. 1457. [17] ZH Zhang, TS Li, F. Yang and CG Fu. Synth. Commun., 28 (1998),... more
... Synth. Commun., 29 (1999), p. 541. [15] B. Karimi and B. Golshani. J. Org. Chem., 65 (2000), p. 7228. [16] N. Azizi and MR Saidi. Organometallics, 23 (2004), p. 1457. [17] ZH Zhang, TS Li, F. Yang and CG Fu. Synth. Commun., 28 (1998), p. 3105. ...
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Iodine and iodine supported on polyvinylpyrrolidone (betadine) have been used as catalysts for ring opening of epoxides and as reagent for ring-opening dimerization of thiiranes in alcohols, water, and acetic acid. The reactions occur... more
Iodine and iodine supported on polyvinylpyrrolidone (betadine) have been used as catalysts for ring opening of epoxides and as reagent for ring-opening dimerization of thiiranes in alcohols, water, and acetic acid. The reactions occur with high regio-, chemo-, and stereoselectivity. The reaction of R-(+)-styrene oxide with I2 supported on PVP in methanol was found to be very stereospecific and the product was isolated in 93% ee. Keywords: iodine, support, polyvinylpyrrolidone, ring opening, epoxides, thiiranes.
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... 1De part ment of Chem is try, Razi Uni ver sity, Kermanshah, Iran Tel: +98 21 66908032; Fax: +98 21 66908030 *e-mail: mshamsipur@ya hoo.com 2De part ment of Chem is try, Shi raz Uni ver sity, Shi raz, Iran 3De part ment of Chem is... more
... 1De part ment of Chem is try, Razi Uni ver sity, Kermanshah, Iran Tel: +98 21 66908032; Fax: +98 21 66908030 *e-mail: mshamsipur@ya hoo.com 2De part ment of Chem is try, Shi raz Uni ver sity, Shi raz, Iran 3De part ment of Chem is try, Lorestan Uni ver sity, Khorramabad ...
Basic alumina is employed as an inorganic basic solid catalyst for the clean and less hazardous pro-tection of carbonyl compounds, such as phenylhydrazones, 2,4-dinitrophenylhydrazones, semicarbazones, and thiosemicarbazones, under ...
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... been applied to the determination of trace heavy metals in water (tap, river, sea and industrial), soil, food, pharmaceuticals, marine sediment and ... J Hazard Mater 145:113 8. Spivakov BY,Malofeeva GI, Petrukhin OM (2006)... more
... been applied to the determination of trace heavy metals in water (tap, river, sea and industrial), soil, food, pharmaceuticals, marine sediment and ... J Hazard Mater 145:113 8. Spivakov BY,Malofeeva GI, Petrukhin OM (2006) Solid-phase extraction on alkylbonded silica gels in ...
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ABSTRACT We describe a simple and efficient procedure for the preparation of sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl)ester (3) by the reaction of 3-(thio(propy-3-yl)silica)-propanol (2) and chlorosulfonic acid in chloroform.... more
ABSTRACT We describe a simple and efficient procedure for the preparation of sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl)ester (3) by the reaction of 3-(thio(propy-3-yl)silica)-propanol (2) and chlorosulfonic acid in chloroform. 3-(Thio(propy-3-yl)silica)-propanol was prepared by the reaction of 3-mercaptopropylsilica (MPS) with 3-chloropropanol in refluxing toluene. This solid sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl)ester is employed as a new catalyst for the formylation of alcohols with ethyl formate under mild and heterogeneous conditions at room temperature with good to excellent yields. Also, 3 can catalyze the acetylation of various alcohols by the reaction of alcohols with ethyl acetate under reflux conditions or with acetic anhydride at room temperature.
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... heterogeneous conditions. Journal Title: South African Journal of Chemistry; Volume: Volume 60; Issue: Publication Date: 2007; Pages: 109 - 112; Authors: Khodabakhsh Niknam; Mohammad Ali Zolfigol; Elaheh Madrakian; Ezat Ghaemi; ...