Abstract
Nickel monophosphine arene adducts have been proposed as highly reactive intermediates capable of difficult C-O bond activation steps in Ni catalyzed cross-coupling reactions. The addition of N-methylmorpholine N-oxide to arene solutions of ([Cy3P)2Ni]2N2 allows for the synthesis of stable (η6-arene)Ni(PCy3) complexes. The isolation of these species demonstrates their viability as intermediates and provides an experimental means to test the hypothesized importance of the Ni(PCy3) moiety in bond activation and catalysis.
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