Réactions d'addition-élimination à partir d'hétérocycles germaniés du type I. Cas des dioxolannes germaniés |
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Authors: | Gabriel Dousse Hlne Lavayssire Jacques Satg |
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Institution: | Gabriel Dousse,Hélène Lavayssière,Jacques Satgé |
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Abstract: | Addition-elimination reactions from germanium heterocycles I. Germadioxolanes (X?Y?O) The reactivity of 2-germa-1,3-dioxolanes is studied with unsaturated compounds such as carbonyl compounds (aldehydes and ketones) or heterocumulenes (PhNCO, PhNCS). The formation of mono- and di-insertion derivatives is observed. The structure of these adducts is established and their decomposition process, at atmospheric pressure or at high pressure, is precised. The mechanism of these addition-elimination reactions is established from 4,5-disubstitued germadioxolanes. The reaction takes place under steric control. The consecutive elimination reaction proceeds by a mechanism of intramolecular nucleophilic substitution. |
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