Process for the preparation of methylenecyclopropane

Details Process for the preparation of methylenecyclopropane Process for the preparation of methylenecyclopropane

C - Chemistry, Metallurgy

07

C

C07C 13/04 (2006.01) C07C 1/28 (2006.01) C07C 1/30 (2006.01)

Patent

CA 2156280

The object of the invention is a novel process for the production of methylenecyclopropane from 3-halogen-2-methyl-1-propene (.beta.-methallyl halogenide). By reacting .beta.-methallyl halogenides with an alkali metal-bis- (trialkylsilyl)-amide, optionally in the presence of an alkali metal alcoholate and/or a corresponding alcohol, methylenecyclopropane is obtained in a high yield, combined with a low or negligible amount of 1-methyl- cyclopropene.

L'objet de cette invention est un nouveau procédé de préparation du méthylènecyclopropane à partir du 3-halogène-2-méthyl-1-propène (halogénure de .beta.-méthallyle). En faisant réagir des halogénures de .beta.-méthallyle avec un métal-bis-(trialcoylsilyl)-amide alcalin, le cas échéant en présence d'un alcoolate alcalino métallique et/ou d'un alcool correspondant, on obtient un rendement élevé de méthylènecyclopropane combiné à une quantité faible ou négligeable de 1-méthyl-cyclopropène.

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