Abstract
AbstractThis brief review discloses our studies on half‐metallocene benzylidene complexes of tantalum bearing 1,3‐butadiene, 2,3‐dimethyl‐1,3‐butadiene, o‐xylylene, 1,4‐diaryl‐1,4‐diaza‐1,3‐butadiene, or 1‐aryl‐4‐phenyl‐1‐aza‐1,3‐butadiene as an auxiliary ligand. These auxiliary ligands can control the stereochemistry of the benzylidene moiety and induce intriguing reactivity. Furthermore, the butadiene and o‐xylylene complexes catalyze ring opening metathesis polymerization of norbornene to respectively give polymers with cis‐ and trans‐CC bonds. Such selectivity can be attributed to control of the stereochemistry of the propagating alkylidene chain end by the auxiliary ligand: the butadiene complex favors the anti‐rotamer while the o‐xylylene complex favors the syn‐one.
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