Mixtures of reducing reagents and 2,6-dimethylphenoxo-tungsten(VI) or -niobium(V) complexes are catalyst precursors for the polymerizations of alk-1-ynes; the number of aryloxo ligands on the metal has been found to control the activity of the polymerization of monoalkylsubstituted acetylenes resulting in the formation of high molecular mass polymers.
Y. Nakayama, K. Mashima and A. Nakamura, J. Chem. Soc., Chem. Commun., 1992, 1496 DOI: 10.1039/C39920001496
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