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Cyclodimerization of α, β-Unsaturated Ketones Promoted by Samarium Diiodide

Abstract Samarium (II) iodide has been successfully utilized as a strong one-electron transfer reducing agent for the cyclodimerization of α, β-unsaturated ketones. The absence of any alcohol as proton source is essential. The reaction is regioselective over the competitive carbon-carbon double bond reduction and stereocontrolled. The configuration of the cyclodimerization products, has been confirmed by X-ray analysis.