Mt. Barros et al., SYNTHESIS OF 2-ALKYLIDENE-3,3-DIALKYL-1,4-DITHIANES AND THEIR OXATHIANE ANALOGS BY 1,2-SULFUR MIGRATION, Heterocycles, 48(6), 1998, pp. 1121-1138
2-Alkylidene-3,3-dialkyl-1,4-dithianes and their oxathiane analogues w
ere prepared from 1,2-diketones by a process involving formation of th
e monodithioacetal, transformation to a tertiary alcohol with organome
tallic reagents and ultimately 1,2-sulphur migration using methanesulp
honyl chloride in pyridine as the activating agent.