Jb. Baudin et al., ON DIMERS OF GAMMA-ACETYLENIC BETA,BETA-DISUBSTITUTED THIOALDEHYDE S-OXIDES AND THEIR TRANSFORMATION INTO SYMMETRICAL (Z)-ALKENES, Synlett, (11), 1993, pp. 839-840
The reaction of allenic sulfinates with vinyl magnesium bromide afford
s the title sulfines which, upon standing, dimerize to the correspondi
ng substituted 1,2-dithietane-1,1-dioxides 4. Treatment of trans 4 wit
h lithium cyanide in THF leads smoothly to the corresponding (Z)-alken
es.