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of a Ni(II)-Ni(I)-Ni(III) catalytic cycle, suggesting a more complicated scheme. Additionally, with the addition of butadiene, the reaction is believed to involve a Ni(IV) intermediate.

Scope

Organic halides and pseudohalides

The Kumada coupling has been successfully demonstrated for a variety of aryl or vinyl halides. In place of the halide reagent pseudohalides can also be used, and the coupling has been shown to be quite effective using tosylate and triflate

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