The nickel-catalyzed intermolecular coupling of allyl acetate or allyl
carbonate with alkynes and alkynyltins was carried out in the presenc
e of LiCl to give 3,6-dien-1-yne regio-and stereoselectively. On the o
ther hand, the intramolecular cyclization and coupling of omega-alkyny
l electrophiles with alkynyltins gave five-membered cyclic products. (
C) 1998 Elsevier Science Ltd. All rights reserved.