Zobrazeno 1 - 10 of 73 pro vyhledávání: '"Georges Bram"'
1
Justus Liebig et les extraits de viande
Autor: Georges Bram, Hervé This
Publikováno v: Sciences des Aliments. 23:577-587
Apres s'etre installe a Munich, le chimiste allemand Justus Liebig tenta d'appliquer les resultats de la chimie organique a l'agriculture et a l'alimentation humaine. Ses extraits de viande eurent beaucoup de succes, mais les idees qui presidaient a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::110d43272cbfcc5ddb1d315b52f522f0
https://doi.org/10.3166/sda.23.577-587
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3
The difficult marriage of theory and French organic chemistry in the 20th century
Autor: Nguyên Trong Anh, Georges Bram
Publikováno v: Journal of Molecular Structure: THEOCHEM. 424:201-206
In the first half of this century, the postivism of many French organic chemists, who were reluctant to speculate about phenomena not directly observable, generated a certain scepticism for theories, with many unfortunate consequences. Thus, reaction
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1fbb3540e1908c2428a6d5783eabc406
https://doi.org/10.1016/s0166-1280(97)00241-8
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7
ChemInform Abstract: Esterification of Carboxylic Acids by Benzyl Chloride Using Quaternary Ammonium Salts
Autor: Kamal Khawaled, André Loupy, Yoel Sasson, Georges Bram, Jihad Dakka
Publikováno v: ChemInform. 23
The nucleophilicity of aliphatic carboxylic acids is enhanced in the presence of quaternary ammonium catalysts; benzyl chloride is esterified directly, e.g., by acetic acid in the absence of a base.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5801812f7ba9553dfbdc2dff3aea7fcb
https://doi.org/10.1002/chin.199201119
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9
Alkylation of potassium acetate in 'dry media' thermal activation in commercial microwave ovens
Autor: Eduardo Ruiz-Hitzsky, Mustapha Majdoub, Elvira Gutierrez, Georges Bram, André Loupy
Publikováno v: Tetrahedron. 46:5167-5176
Microwave irradiation using commercial domestic ovens is very efficient to activate potassium acetate on alumina in the absence of solvent (“dry media”) giving rise to remarkable rate enhancements in alkylation reactions with long chain halides.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a8f1804b0111ae1b6128907d0d6e510c
https://doi.org/10.1016/s0040-4020(01)87823-6
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10
Microwave Irradiation Plus Solid-Liquid Phase Transfer Catalysis Without Solvent: Further Improvement in Anionic Activation
Autor: Mustapha Majdoub, André Loupy, Georges Bram
Publikováno v: Synthetic Communications. 20:125-129
Owing to cumulative effects of microwave irradiation and solid-liquid PTC without solvent methodology, conditions for alkylations of potassium acetate by n-octyl or n-cetyl halides are nearly quantitative within 2 minutes on appreciable quantities.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fba8eba18a594d210b9b3e945b494e42
https://doi.org/10.1080/00397919008054623
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