Thermal conversion of primary alcohols to disulfides via xanthate intermediates: an extension to the Chugaev elimination

Org Biomol Chem. 2018 Mar 7;16(10):1659-1666. doi: 10.1039/c8ob00024g.

Abstract

Primary alcohols are converted into dialkyl disulfides via heating in situ generated O-alkyl S-difluoro(ethoxycarbonyl)methyl xanthates from ethyl bromodifluoroacetate and potassium xanthates, prepared from primary alcohols and carbon disulfide in the presence of KOH. The reaction mechanism is suggested as an alkyl C[1,3] shift followed by a radical mechanism. This extends to the Chugaev elimination which yields olefins. The current research provides easy access to dialkyl disulfides from commercially available primary alkanols.