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Low-valent Ti II species have typically been synthesized by the reaction of Ti IV halides with strong metal reductants. Herein we report that Ti II species can be generated simply by reacting Ti IV imido complexes with 2 equiv of alkyne, yielding a metallacycle that can reductively eliminate pyrrole while liberating Ti II . In order to probe the generality of this process, Ti II -catalyzed alkyne trimerization reactions were carried out with a diverse range of Ti IV precatalysts.

Generation of TiII Alkyne Trimerization Catalysts in the Absence of Strong Metal Reductants

Generation of Ti^II Alkyne Trimerization Catalysts in the Absence of Strong Metal Reductants