Y. Masuyama et al., PALLADIUM-CATALYZED DEHYDRATION OF PROPYNYL ALCOHOLS WITH TIN(II) CHLORIDE, Journal of the Chemical Society, Chemical Communications, (15), 1993, pp. 1219-1220
Alpha,gamma-Disubstituted propynyl alcohols having a proton on 1-posit
ion of alpha-substituent have been dehydrated using PdCl2(PPh3)2 and S
nCl2 in 1,3-dimethylimidazolidin-2-one under neutral conditions to pro
duce 1,4-disubstituted (Z)-but-3-en-1-ynes stereoselectively.