Catalyst-Free and Mild Method to Turn Sulfides into Sulfoxides

What is it about?

This study presents a simple, catalyst-free method for oxidizing various organic sulfides (dialkyl, alkylaryl, and benzyl) into sulfoxides under mild room-temperature conditions. By utilizing readily available gem-dihydroperoxides, such as commercially produced 1,1-dihydroperoxycyclohexane, as mild oxidizing agents, the reaction achieves excellent yields (>95%) and remarkable selectivity. The process avoids harsh acids or metallic catalysts, preventing unwanted overoxidation to sulfones and leaving sensitive functional groups intact.

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Why is it important?

Sulfoxides are critical chemical structures found in numerous pharmaceuticals, agrochemicals, and functional materials. Traditional oxidation methods often require toxic transition-metal catalysts, strong acids, or expensive reagents, which frequently lead to overoxidation into sulfones or damage sensitive molecular moieties. Our catalyst-free approach addresses these limitations by using accessible, inexpensive gem-dihydroperoxides under ambient conditions. Demonstrating exceptional chemoselectivity and diastereoselectivity even in complex natural product analogs, this method provides a cleaner, safer, and highly efficient protocol for organic synthesis.

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