Add time:07/22/2019         Source:sciencedirect.com

Highly congested thiophene 1,1-dioxides, which carry two bulky substituents at 3- and 4-positions, afford the corresponding epoxides in high yields on oxidation with m-chloroperbenzoic acid in the presence of sodium carbonate, while the oxidation in the absence of sodium carbonate gives the ring-contracted thiete 1,1-dioxides as the principal product.

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