Abstract
α-Ketoalkynes react with KCN, catalyzed by anionic Ni(0) cyano complexes in water, affording unsaturated hydroxylactams. The active anionic species, thought to be [Ni(CN)4]4-, can be formed in situ from Ni(II) cyano compounds under various reduction conditions. A possible mechanism, excluding Ni−hydride intermediates, is proposed.
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