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Abstract:
A new concept for C-C-bond formations catalyzed by early transition metals
in low oxidation state is outlined. It allows to perform intramolecular reductive
carbonyl coupling reactions catalytic in titanium, accounts for the first chromiumcatalyzed
Nozaki-Hiyama-Kishi reactions, and has been successfully applied to
titanium-, samarium- or vanadium-catalyzed pinacolization reactions.