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Novel palladium complexes demonstrate selective cross-coupling in organozinc reactions, suggesting improved efficiency.
No migration? No problem! A series of new N-heterocyclic carbene based Pd complexes has been created and evaluated in the Negishi cross-coupling of aryl and heteroaryl chlorides, bromides, and triflates with a variety of secondary alkylzinc reagents. The direct elimination product is nearly exclusively formed; in most examples there is no migratory insertion at all.
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Pompeo et al. (2012) studied this question.
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