Electrophilic allyl derivatives zinc compounds

Copper derivatives, in the form of cuprates (RCu(X)Li), are usually prepared in situ from lithium, magnesium or zinc compounds, by reaction with a Cu(I) sonrce snch as CnCN. They are often used to improve conversions using, for example, an acid chloride or an allylic halide as electrophile - a number of examples appear in other sections of this book. They are also nsefnl as the organometallic partners in some crosscoupling reactions (using cobalt catalysts). ... 

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