Abstract
Carbon-carbon bond-forming reactions mediated by one-electron reduction of Fischer-type carbene complexes of Group 6 metals were investigated. In the case of aryl- or silylcarbene complexes of tungsten, the anion radical species generated by one-electron reduction smoothly underwent addition reaction to ethyl acrylate. One-electron reduction of alpha,beta-unsaturated carbene complexes afforded biscarbene complexes by dimerization of the corresponding anion radical species at the position gamma to the metal center. In contrast, one-electron reduction of chromium phenyl- or alkylcarbene complexes gave, via carbonyl insertion, alpha-methoxyacylchromate complexes, which further underwent conjugate addition to various electron-poor olefins to give the corresponding alpha-methoxyketones.
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