Answers are grounded in this paper and cite their sources.
A heretofore unknown LDA-induced conversion of benzyl 1-alkynyl sulfones to 1H-2-benzothiopyran-S,S-dioxides is demonstrated. A benzyl carbanion, accessible by two means, is thought to cyclize by temporary disruption of aromaticity. Key intermediates are observed by ReactIR analysis. Thiophene derivatives are also amenable to cyclization, forming 7H-thieno[2,3-c]thiopyran-S,S-dioxides.
No takes yet. Share an insight, caveat, or question.
Hossain et al. (2011) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: