METALLACYCLOALKYLENE COMPLEXES AND USE FOR ALKYNE POLYMERIZATION TO CYCLIC POLYACETYLENES
摘要:
A poly-unsaturated cyclic polymer can be prepared by the polymerization of alkyne monomers with a catalyst that is selected from trianionic pincer ligand supported metal-alkylidyne complexes, tetraanionic pincer ligand supported metal-alkynes, or tetraanionic pincer ligand supported metallacycloalkylene complexes. The [O 2 C( t BuC=)W( η 2 -HC≡ C t Bu)] (4) provides high polymerization rates and high molecular weight cyclic polymers. The poly-unsaturated cyclic polymers can be hydrogenated to saturated cyclic polymers. A cyclic polyphenylacetylene can be converted into a cyclic polystyrene.
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