One of the most impressive advances in organocopper chemistry over the past decade has been the development of methodology for preparing cuprates bearing ligands which contain various electrophilic centers. Existing protocols to these valuable reagents include (1) oxidative addition of extremely reactive Rieke copper to alkyl halides,'(2) insertion of Zn (0) into alkyl halides followed by transmetalation with CuCN2LiC1? and (3) low-temperature ...
