Generation of Ketocarbenoid by α-Elimination of ω,ω-Dibromoacetophenone with Copper, and Trapping by Cycloaddition to Olefins

Abstract

Abstract Ketocarbenoid was generated by the reaction of ω,ω-dibromoacetophenone with copper in aromatic hydrocarbon, and was trapped by cycloaddition to olefins. This is the first example of cyclopropanation of olefins by formally divalent carbon intermediate without use of diazoketones.