Zinc (0)-Mediated Formation of Carbon-Carbon Bond from γ-Bromo Crotonate

Abstract
The coupling reaction of allylic halides with diffferent organometallic reagents has been widely utilized for synthetic purpose.1 Unfortunately, with the exception of primary halides which give mostly α attack and of hindered substrates which prefer γ attack, the lack of regioselectivity is a great handicap for the generalization of the method.