Http Dx Doi Org 10 1081 Scc 200030569, Jan 12, 2011
ABSTRACT Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/S... more ABSTRACT Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/SiO2) was used to synthesize nitro derivative and ipso substitution products. The position of the substituents defines the type and the yields of the products. This is the first example of an ipso substitution reaction by solid‐phase approach.
In this paper we investigated the degradation of the rivastigmine drug induced by hydroxyl radica... more In this paper we investigated the degradation of the rivastigmine drug induced by hydroxyl radical in synthetic and natural waters focusing on both reactivity and photoproducts identification. The hydroxyl radical formation rate was quantified by using terephthalic acid as trapping molecule and it was related with the rivastigmine degradation rate. The second order rate constant between hydroxyl radical and rivastigmine was estimated to be ≈ 5.8 × 10(9) M(-1) s(-1). Irradiation of rivastigmine in three natural waters (rain, lake and river) and comparison with degradation rates observed in synthetic solutions using nitrite, nitrate and hydrogen peroxide suggest that, in addition to hydroxyl radical, also nitroderived radicals (NO/NO2) are responsible for the pollutant degradation in natural media. In fact, the evaluated degradation rates in three natural waters are greatly higher than those estimated considering only the reactivity with photogenerated hydroxyl radical. Using nitrites...
The treatment of olive oil mill wastewater (OMW) with two phenol resistant algae, Ankistrodesmus ... more The treatment of olive oil mill wastewater (OMW) with two phenol resistant algae, Ankistrodesmus braunii and Scenedesmus quadricauda, showed a limited reduction of phenol content after 5 d of treatment, irrespective of algal concentration. Otherwise, cultures of both algae, grown in the dark, degraded over 50% of the low molecular weight phenols contained in OMW, but they were not completely removed, but were biotransformed into other non-identified, aromatic compounds.
... Marina DellaGreca a , Gabriele Pinto b , Antonino Pollio b , Lucio Previtera a and Fabio Temu... more ... Marina DellaGreca a , Gabriele Pinto b , Antonino Pollio b , Lucio Previtera a and Fabio Temussi a , Corresponding Author Contact Information , E-mail The Corresponding Author. ... 4. Nichols, HW In Handbook of Phycological Methods; Stein, JR. Ed. Growth media freshwater. ...
In this study, a comparison of two carbamic pesticides, chlorpropham and phenisopham, was carried... more In this study, a comparison of two carbamic pesticides, chlorpropham and phenisopham, was carried out in terms of both photodegradability and ecotoxicity. The photochemical behaviour of the two pesticides was investigated under environmental-like conditions (aqueous media, UVB or solar irradiation). The photochemical kinetic parameters were calculated by irradiating 5 × 10(-5) M solutions (H₂O-CH₃CN, 9 : 1 v/v) using UVB lamps. For chlorpropham and phenisopham similar half-life times (39.0 and 55.0 min) were determined. Irradiation by sunlight leads to longer degradation half-life times (about 3 months), while it is possible to observe the formation of the same photoproducts. The well-known dechlorination reaction to a hydroxyphenylcarbamate was observed for chlorpropham. Phenisopham undergoes photo-Fries reaction to give rearranged products (hydroxybenzamides) and fragmentation products (hydroxyphenylcarbamate and N-ethylaniline). Acute and chronic toxicity tests of pesticides and their photoproducts were performed on organisms from two levels of the freshwater aquatic chain, the anostraca crustacean Thamnocephalus platyurus, the rotifer Brachionus calyciflorus and the alga Pseudokirchneriella subcapitata. The acute results showed that chlorpropham had median lethal concentrations for the crustacean T. platyurus and the rotifer B. calyciflorus of 10.16 and 35.19 mg L(-1), respectively, and phenisopham did not show any acute toxicity as the derivatives up to 10 mg L(-1). The only exception was N-ethylaniline which exhibited an acute LC₅₀ value of 0.46 mg L(-1). Phenisopham was the most toxic in the long term exposure while its five derivatives showed lower chronic potential for rotifers and algae. The same trend was observed for chlorpropham except for rotifers.
ABSTRACT Alditols have been obtained in very high yield using an excess of electron-rich furans w... more ABSTRACT Alditols have been obtained in very high yield using an excess of electron-rich furans with respect to the protected sugars. The scope and limitation of the reaction have been explored.
Abstract Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/S... more Abstract Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/SiO2) was used to synthesize nitro derivative and ipso substitution products. The position of the substituents defines the type and the yields of the products. This is the first ...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013
The title paper reports a study on the structural elucidation by spectroscopic and computational ... more The title paper reports a study on the structural elucidation by spectroscopic and computational methods of the products obtained from the reaction of two conformers of quercetin with the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(•)). Many points of criticism, concerning both theoretical principles and experimental data, are highlighted in the present communication.
Http Dx Doi Org 10 1081 Scc 200030569, Jan 12, 2011
ABSTRACT Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/S... more ABSTRACT Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/SiO2) was used to synthesize nitro derivative and ipso substitution products. The position of the substituents defines the type and the yields of the products. This is the first example of an ipso substitution reaction by solid‐phase approach.
In this paper we investigated the degradation of the rivastigmine drug induced by hydroxyl radica... more In this paper we investigated the degradation of the rivastigmine drug induced by hydroxyl radical in synthetic and natural waters focusing on both reactivity and photoproducts identification. The hydroxyl radical formation rate was quantified by using terephthalic acid as trapping molecule and it was related with the rivastigmine degradation rate. The second order rate constant between hydroxyl radical and rivastigmine was estimated to be ≈ 5.8 × 10(9) M(-1) s(-1). Irradiation of rivastigmine in three natural waters (rain, lake and river) and comparison with degradation rates observed in synthetic solutions using nitrite, nitrate and hydrogen peroxide suggest that, in addition to hydroxyl radical, also nitroderived radicals (NO/NO2) are responsible for the pollutant degradation in natural media. In fact, the evaluated degradation rates in three natural waters are greatly higher than those estimated considering only the reactivity with photogenerated hydroxyl radical. Using nitrites...
The treatment of olive oil mill wastewater (OMW) with two phenol resistant algae, Ankistrodesmus ... more The treatment of olive oil mill wastewater (OMW) with two phenol resistant algae, Ankistrodesmus braunii and Scenedesmus quadricauda, showed a limited reduction of phenol content after 5 d of treatment, irrespective of algal concentration. Otherwise, cultures of both algae, grown in the dark, degraded over 50% of the low molecular weight phenols contained in OMW, but they were not completely removed, but were biotransformed into other non-identified, aromatic compounds.
... Marina DellaGreca a , Gabriele Pinto b , Antonino Pollio b , Lucio Previtera a and Fabio Temu... more ... Marina DellaGreca a , Gabriele Pinto b , Antonino Pollio b , Lucio Previtera a and Fabio Temussi a , Corresponding Author Contact Information , E-mail The Corresponding Author. ... 4. Nichols, HW In Handbook of Phycological Methods; Stein, JR. Ed. Growth media freshwater. ...
In this study, a comparison of two carbamic pesticides, chlorpropham and phenisopham, was carried... more In this study, a comparison of two carbamic pesticides, chlorpropham and phenisopham, was carried out in terms of both photodegradability and ecotoxicity. The photochemical behaviour of the two pesticides was investigated under environmental-like conditions (aqueous media, UVB or solar irradiation). The photochemical kinetic parameters were calculated by irradiating 5 × 10(-5) M solutions (H₂O-CH₃CN, 9 : 1 v/v) using UVB lamps. For chlorpropham and phenisopham similar half-life times (39.0 and 55.0 min) were determined. Irradiation by sunlight leads to longer degradation half-life times (about 3 months), while it is possible to observe the formation of the same photoproducts. The well-known dechlorination reaction to a hydroxyphenylcarbamate was observed for chlorpropham. Phenisopham undergoes photo-Fries reaction to give rearranged products (hydroxybenzamides) and fragmentation products (hydroxyphenylcarbamate and N-ethylaniline). Acute and chronic toxicity tests of pesticides and their photoproducts were performed on organisms from two levels of the freshwater aquatic chain, the anostraca crustacean Thamnocephalus platyurus, the rotifer Brachionus calyciflorus and the alga Pseudokirchneriella subcapitata. The acute results showed that chlorpropham had median lethal concentrations for the crustacean T. platyurus and the rotifer B. calyciflorus of 10.16 and 35.19 mg L(-1), respectively, and phenisopham did not show any acute toxicity as the derivatives up to 10 mg L(-1). The only exception was N-ethylaniline which exhibited an acute LC₅₀ value of 0.46 mg L(-1). Phenisopham was the most toxic in the long term exposure while its five derivatives showed lower chronic potential for rotifers and algae. The same trend was observed for chlorpropham except for rotifers.
ABSTRACT Alditols have been obtained in very high yield using an excess of electron-rich furans w... more ABSTRACT Alditols have been obtained in very high yield using an excess of electron-rich furans with respect to the protected sugars. The scope and limitation of the reaction have been explored.
Abstract Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/S... more Abstract Treatment of cinnamic acids with cerium (IV) ammonium nitrate supported on silica (CAN/SiO2) was used to synthesize nitro derivative and ipso substitution products. The position of the substituents defines the type and the yields of the products. This is the first ...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013
The title paper reports a study on the structural elucidation by spectroscopic and computational ... more The title paper reports a study on the structural elucidation by spectroscopic and computational methods of the products obtained from the reaction of two conformers of quercetin with the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(•)). Many points of criticism, concerning both theoretical principles and experimental data, are highlighted in the present communication.
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