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Papers by Farba Tamboura Chemical science international journal , Nov 21, 2023
Earthline Journal of Chemical Sciences , Jul 7, 2021
Zenodo (CERN European Organization for Nuclear Research) , Apr 28, 2023
Acta Crystallographica Section E-structure Reports Online , Apr 6, 2012
Acta Crystallographica Section E-structure Reports Online , Dec 8, 2012
Science journal of chemistry , 2022
Bulletin of The Chemical Society of Ethiopia , May 8, 2006
Inorganic Chemistry Communications , Aug 1, 2003
Earthline Journal of Chemical Sciences , Aug 23, 2022
HAL (Le Centre pour la Communication Scientifique Directe) , 2022
Zeitschrift Fur Kristallographie-new Crystal Structures , Apr 1, 2001
European Journal of Organic Chemistry , Jul 1, 2009
Following the discovery of an unprecedented transamination reaction between primary alkylamines a... more Following the discovery of an unprecedented transamination reaction between primary alkylamines and a quinonoid molecule of the type [C6H2([pb2]NHCH2R)2([pb2]O)2] (1), obtained from commercially available diaminoresorcinol·2HCl, we have extended this method to the use of primary arylamines, and found that, in contrast, secondary amines led to a different outcome. Whereas functionalized molecules of type 1, which are best described as 6π + 6π zwitterions, were obtained with aniline or 4‐methoxyaniline, no transmination was observed with tBuNH2 in ethanol. In water, however, a reaction took place, but it afforded instead salt 6a, which resulted from hydrolysis of the imine group and deprotonation. Under similar conditions, secondary amines led to comparable results. The cations associated with the anionic quinonoid are readily exchanged in the presence of a primary amine. Whereas for the transamination reaction basic amines react under mild conditions, slightly harsher conditions are needed for less basic amines such as piperidine, diisopropylamine, or diethylamine. Transamination reactions were also performed with bis(methylamino) quinoneimine 4c, which is more soluble in organic solvents than 3. This led to the first examples of quinonoidal zwitterions functionalized with different alkyl groups on the nitrogen atoms. A number of compounds were characterized by X‐ray diffraction, which allowed a better understanding of their electronic situation, and in many cases, the presence of multiple hydrogen‐bond donors and acceptors results in crystal packings dominated by these interactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Inorganic Chemistry Communications , Apr 1, 2002
Polyhedron , Apr 1, 2004
Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and ... more Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln (C23H19N5O2)(H2O)(NO3)](Ln= Y or Er) and {[Ln (C23H19N5O2)(C23H20N5O2)](H2O) ...
HAL (Le Centre pour la Communication Scientifique Directe) , 2019
Earthline Journal of Chemical Sciences , Dec 16, 2021
Acta Crystallographica Section E-structure Reports Online , Dec 20, 2008
Chemical science international journal , Nov 21, 2023
Earthline Journal of Chemical Sciences , Jul 7, 2021
Zenodo (CERN European Organization for Nuclear Research) , Apr 28, 2023
Acta Crystallographica Section E-structure Reports Online , Apr 6, 2012
Acta Crystallographica Section E-structure Reports Online , Dec 8, 2012
Science journal of chemistry , 2022
Bulletin of The Chemical Society of Ethiopia , May 8, 2006
Inorganic Chemistry Communications , Aug 1, 2003
Earthline Journal of Chemical Sciences , Aug 23, 2022
HAL (Le Centre pour la Communication Scientifique Directe) , 2022
Zeitschrift Fur Kristallographie-new Crystal Structures , Apr 1, 2001
European Journal of Organic Chemistry , Jul 1, 2009
Following the discovery of an unprecedented transamination reaction between primary alkylamines a... more Following the discovery of an unprecedented transamination reaction between primary alkylamines and a quinonoid molecule of the type [C6H2([pb2]NHCH2R)2([pb2]O)2] (1), obtained from commercially available diaminoresorcinol·2HCl, we have extended this method to the use of primary arylamines, and found that, in contrast, secondary amines led to a different outcome. Whereas functionalized molecules of type 1, which are best described as 6π + 6π zwitterions, were obtained with aniline or 4‐methoxyaniline, no transmination was observed with tBuNH2 in ethanol. In water, however, a reaction took place, but it afforded instead salt 6a, which resulted from hydrolysis of the imine group and deprotonation. Under similar conditions, secondary amines led to comparable results. The cations associated with the anionic quinonoid are readily exchanged in the presence of a primary amine. Whereas for the transamination reaction basic amines react under mild conditions, slightly harsher conditions are needed for less basic amines such as piperidine, diisopropylamine, or diethylamine. Transamination reactions were also performed with bis(methylamino) quinoneimine 4c, which is more soluble in organic solvents than 3. This led to the first examples of quinonoidal zwitterions functionalized with different alkyl groups on the nitrogen atoms. A number of compounds were characterized by X‐ray diffraction, which allowed a better understanding of their electronic situation, and in many cases, the presence of multiple hydrogen‐bond donors and acceptors results in crystal packings dominated by these interactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Inorganic Chemistry Communications , Apr 1, 2002
Polyhedron , Apr 1, 2004
Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and ... more Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln (C23H19N5O2)(H2O)(NO3)](Ln= Y or Er) and {[Ln (C23H19N5O2)(C23H20N5O2)](H2O) ...
HAL (Le Centre pour la Communication Scientifique Directe) , 2019
Earthline Journal of Chemical Sciences , Dec 16, 2021
Acta Crystallographica Section E-structure Reports Online , Dec 20, 2008
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Papers by Farba Tamboura