Abstract gem-Dichloroallyllithium may be prepared by the reaction of n-butyllithium with 3, 3, 3-trichloropropene or, better, by reaction of n-butyllithium with Ph 3 PbCH 2 CH CCl 2 in THF at low temperatures. In reactions with trimethylchlorosilane, iodomethane and water the products are indicative of the presence of LiCCl 2 CH CH 2, but its reactions with trimethyltin bromide and mercuric chloride give products indicative of the presence of ...
