Fragmentation of selenoxides: a new method for dehydrogenation of ketones

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Abstract
The enol acetates of cyclohexanone and cyclopentanone react with PhSeBr and AgOCOCF3 at low temperature to give, after work-up and oxidation (NaIO4), cyclohex-2-en-1-one and cyclopent-2-en-1-one.