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Thermal conversion of primary alcohols to disulfides via xanthate intermediates: an extension to the Chugaev elimination†
Wei He,Yong Ding,Jianzhuo Tu,Chuqiang Que,Zhanhui Yang,Jiaxi Xu
Organic & Biomolecular Chemistry Pub Date : 02/08/2018 00:00:00 , 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.

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