M. Yoshimatsu et al., DEHYDROSULFONYLATION OF CONJUGATED ENYNE SULFONES - CONVENIENT SYNTHESIS OF DIYNE COMPOUNDS, Journal of the Chemical Society, Chemical Communications, (5), 1995, pp. 583-584
alpha-Lithio conjugated enyne sulfones, easily generated from enyne su
lfones 1 and 2 and MeLi, upon reaction with carbonyl compounds followe
d by treatment with MeLi afford the 2,4-diynols 4a-g and 5a-c in high
yields.