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2 results on '"Denis Belanger"'

1. Reaction of di(bromomagnesio)alkanes with unsymmetrically substituted cyclic anhydrides

Author

Gilles Lemay, Persephone Canonne, and Denis Belanger

Subjects
Steric effects, chemistry.chemical_compound, Chemistry, Organic Chemistry, Drug Discovery, Organic chemistry, Alkylation, Biochemistry, Tetrahydrofuran
Abstract

Alkylated γ-spirolactones were prepared in one-step reactions in high yields from butane-1,4-diyl and pentane-1,5 diyldimagnesium dibromides and substituted cyclic anhydrides in tetrahydrofuran. In the light of experimental findings electronic and steric factors influence the regiospecificity of this reaction.

Published
1980

2. Steric effects ih the reaction of di(bromomagnesio)alkanes with carboxylic esters

Author

Persephone Canonne, Denis Belanger, and Gilles Lemay

Subjects
Steric effects, Pentane, chemistry.chemical_compound, Annulation, chemistry, Organic Chemistry, Drug Discovery, Organic chemistry, Butane, Biochemistry
Abstract

Largely different product distributions were observed on the action of various carboxylic esters with 1,4-di(bromomagnesio)butane and its homologue 1,5-di(bromomagnesio)pentane. The much larger yields of reduction product with the latter are the evidence for the structural geometric requirements for the annelation step.

Published
1981

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