Cp. Raj et S. Braverman, Synthesis of conjugated diallenes by double [2,3]-sigmatropic rearrangement of conjugated diyne trichloromethanesulfenates, SYN COMMUN, 29(15), 1999, pp. 2629-2637
The preparation of several 2,4-diyne-1,6-diols and their esterification wit
h trichloromethanesulfenyl chloride is described. The thus generated bis-pr
opargylic trichloromethanesulfenates undergo spontaneous double [2,3]-sigma
tropic rearrangement which leads to the formation of conjugated diallenic t
richloromethyl sulfoxides in good to excellent yields.