Scheme 10.

A. Tanaka’s palladium-catalyzed elimination reaction with diethylzinc. B. Kazmaier’s 2-Sn(n-Bu)3 elimination of 2-stannylated allylic acetates and phenoxides to form terminal allenes.

A. Tanaka’s palladium-catalyzed elimination reaction with diethylzinc. B. Kazmaier’s 2-Sn(n-Bu)3 elimination of 2-stannylated allylic acetates and phenoxides to form terminal allenes.