A new method of generation of bismuthonium ylides and their efficient trapping with sulphenes

Abstract
Bismuthonium ylides are generated by reacting triphenylbismuth oxide or dichloride with sodium salts of cyclic and open chain 1,3-dicarbonyl compounds; ylides from open chain 1,3-dicarbonyl compounds, which readily decompose on standing to produce C-phenylation product, can be efficiently trapped by sulphenes to afford 1,3-oxathiole-3,3-dioxides in good yields.

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