Abstract A facile synthesis of 3-substituted methyl 4,6-dihydrothieno[3,4-b]thiophene-carboxylate 5,5-dioxides 1 from 3-(phenylthio)-4-acyl-3-sulfolenes 2 and their use as stable precursors of o-dimethylene thiophene 3 in [4 + 2] cycloaddition are described.

This facile synthesis of 3-substituted methyl 4,6-dihydrothieno[3,4-b]thiophene-carboxylate 5,5-dioxides from 3-(phenylthio)-4-acyl-3-sulfolenes 2 provides stable

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A Facile Synthesis of 3-Substituted Methyl 4,6-Dihydrothieno[3,4-b]thiophene-2-carboxylate 5,5-Dioxides as Precursors of o-Dimethylene Thiophene

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