Organocoppers, 154. reacting with enones

These organocopper reagents (equation I) react with various electrophiles, aldehydes, acid chlorides, enones, allylic bromides, in 85-95% yield."... 

Acylzirconocene derivatives can also be further transmetaUated by addition of a catalytic amount of a copper salt. These species behave as organocopper derivatives and undergo S 2 reactions with allyl- [36] and propargylic halides [36], but also undergo Michad-type addition with aDenyl ketones and enones [37] and finally react with acetyl chlorides [38] (Scheme 12.29). 

Addition to a, -unsaturated carbonyl compounds is characteristic of organocopper and cuprate compounds, as alkyllithium and Grignard reagents react only with the carbonyl group of enones to give the 1,2-addition products. This synthetically useful reaction has been reviewed by Posner (1972). 

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