The MCPBA-oxidation of 8<i>H</i>-Cyclohepta[<i>b</i>]thiophen-8-ones to Their 1,1-Dioxides and Further Ring-contracted Benzo[<i>b</i>]thiophene Derivatives
Upon MCPBA-oxidation, several 8H-cyclohepta[b]thiophen-8-ones yielded the 8H-cyclohepta[b]thiophen-8-one 1,1-dioxides and their epoxides. The latters were shown to be convertible to several ring-contracted derivatives, the benzo[b]thiophene1,1-dioxides and/or their corresponding phenol and salicylaldehyde derivatives.