Gilman reagent reaction with acid chlorides

The ketone intermediate formed during the Grignard reaction of an acid chloride can t usually be isolated because addition of the second equivalent of organomagnesium reagent occurs too rapidly. A ketone can, how-, ever, be isolated from the reaction of an acid chloride with a diorganoi p per (Gilman) reagent (Section 19.2) ... 

Acid chlorides react readily with lithium diorganocopper (Gilman) reagents (Section 15.2) to give ketones, as illustrated by the conversion of pentanoyl chloride to 2-hexanone. The reaction is carried out at -78°C in either diethyl ether or tetrahy-drofuran. Following hydrolysis in aqueous acid, the ketone is isolated in good yield. 

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