Terminal acetylenes react with Bu, SnAlEh in the presence of Cu+ or PdO catalysts to give 1, 2-dimetallo-l-alkenes in highly regio-and stereoselective reactions. These intermediates can be selectively functionalized at the vinyl-aluminum bond to provide vinylstannanes, which upon transmetalation and further reaction with electrophiles give stereodefined trisubstituted olefins. In sharp contrast to the normal behavior of alkylaluminum reagents, this process ...
