Abstract
The (imido)niobium(V)–alkylidene complexes Nb(CHSiMe3)(NR)[OC(CF3)3](PMe3)2 (R = 2,6-Me2C6H3, 2,6-iPr2C6H3, 1-adamantyl), which could be isolated from the dialkyl analogues by α-hydrogen elimination in the presence of PMe3, exhibited remarkable catalytic activities for ring-opening metathesis polymerization (ROMP) of norbornene, and the polymerizations proceeded in a living manner. Metathesis polymerizations of (unstrained) disubstituted acetylenes also took place, affording polymers with uniform (narrow) molecular weight distributions.
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