N. Asao et al., LEWIS-ACID CATALYZED TRANS-HYDROSTANNYLATION OF ACETYLENES, Journal of the Chemical Society, Chemical Communications, (23), 1995, pp. 2405-2406
A Lewis acid such as ZrCl4 or HfCl4 catalyses the hydrostannylation of
acetylenes 1 to produce the trans-hydrostannylation products 2 regio-
and stereo-selectively.