During the last four years, we have reported the alkenylation, allenylation, or alkynylation of GeCl 4 , 10 SnCl 4 , 11 AsCl 3 , 12 or SbCl 3 13 by vinylic, allenyl, and alkynyltri-n-butylstannane. We have recently described the formation of allylic dihalophosphines, -arsines, and -stibines by reaction of an allylic tri-n-butylstannane with PCl 3 or PBr 3 , AsCl 3 , or SbCl 3 respectively. 14 Although the low reactivity of the phosphorus and arsenic derivatives permitted their isolation and ...