Bulky aryloxo complexes of tungsten and niobium as catalyst precursors for high polymerization of alk-1-ynes
Abstract
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.