Abstract
Main observation and conclusionRing‐opening metathesis polymerization (ROMP) of norbornene by binuclear vanadium alkylidene in‐situ formed from dialkyl complexes was investigated. Higher activities were observed by the binuclear system than mononuclear analogues. Especially the cyclic polymers were obtained and demonstrated. It is proposed that cyclic binuclear vanadium alkylidene was afforded due to the intramolecular chain‐transfer reaction. The size of polymer ring could be adjusted by the vanadium catalyst structure and polymerization temperature. Similar results were also observed in the ROMP of cyclopentene.
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