Chromyl chloride reaction with silyl enol ethers

A hydroxyl group may be introduced a- to a ketone group by the reaction of chromyl chloride with the ketone silyl enol ether in dichloromethane at low temperature, No a-chloro-ketones were observed as by-products. Alternatively, an alkoxy-group may be introduced by the reaction of the silyl enol ether with alkyl hypochlorites, catalysed by tetrakis(triphenylphosphine)palladium. ... 

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