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Your search keyword '"Jazid Kabbara"' showing total 11 results
Start Over Author "Jazid Kabbara" Topic general medicine
11 results on '"Jazid Kabbara"'

10. ChemInform Abstract: The Role of Silanes on the Copper-Catalyzed Conjugate Alkylation of Enones by Organoaluminium Reagents

Author

Steffen Flemming, Jürgen Westermann, Harribert Neh, Jazid Kabbara, and Klaus Nickisch

Subjects
chemistry.chemical_compound, Silanes, Chemistry, Reagent, Copper catalyzed, Organic chemistry, General Medicine, Methylation, Alkylation, Trimethylaluminium, Catalysis, Conjugate
Abstract

The effect of silanes as additives in the copper-catalyzed conjugate alkylation of enones by various organoaluminium reagents was investigated. TMSCl led to significant lower amounts of CuBr catalyst needed in the reaction of trimethylaluminium with enones, but was unsuccessful in the case of organoaluminium compounds of the formula Me 2 AlY (Y = Cl, OR). Me 2 AlOEt turned out to be a useful reagent for methylation without support of additives.

Published
1995
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11. ChemInform Abstract: Silica Gel-Catalyzed Cyclizations of Mixed Ketene Acetals

Author

Dieter Schinzer, Markus Kalesse, and Jazid Kabbara

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Trimethylsilyl chloride, Bicyclic molecule, Chemistry, Silica gel, Polymer chemistry, Ketene, General Medicine, Bridged compounds, Methyl acrylate, Catalysis
Abstract

The 3-methoxy-2-cyclohexenones (I) react consecutively with LDA, methyl acrylate (II), and trimethylsilyl chloride (III) to form the ketene acetals (IV) which are desilylated and cyclized in the presence of SiO2 or TiCl4, yielding the bicyclic esters (V).

Published
1989
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