Isolation of η2-(C,C) ketene complexes of nickel from the reactions of nickelacyclobutane complexes with carbon monoxide

Abstract
The η2(C,C) ketene complex [Ni(CH2 CO)(PPh3)2], a model complex for homogeneous CO reduction, was isolated by carbonylation of nickelacyclobutane complexes or by the reaction of [Ni(PPh3)4] with CH2Br2 in the presence of Zn followed by carbonylation.

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