Abstract
Abstract Although the reaction mechanism is obscure at present, 2,4,4,6-tetrabromo-2,5-cyclohexadien-1-one (2) was found to be a good reagent for the selective bromination of polyenes, that is, terminal double bond of geranyl and farnesyl cyanides was selectively brominated by merely being stirred with equimolar amount of 2 in CH2Cl2 solution, giving 6,7-dibromogeranyl (yield 98%) and 10,11-dibromofarnesyl (yield 65%) cyanide, respectively.
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