Bromine–magnesium exchange in gem-dibromocyclopropanes using Grignard reagents
作者:Mark S Baird、Alexey V Nizovtsev、Ivan G Bolesov
DOI:10.1016/s0040-4020(02)00018-2
日期:2002.2
Reaction of gem-dibromocyclopropanes with ethylmagnesium bromide at ambient temperature leads to very high yields of allenes; when cyclopropylidene-allene ring opening is suppressed, alternative carbenic products are observed, although other reactions compete. When the reactions are carried out at -60degreesC, a 1-bromo-1-(bromomagnesio)-cyclopropane is formed which may be trapped by a number of electrophiles. (C) 2002 Elsevier Science Ltd. All rights reserved.