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Experimental Evidence for Large Ring Metallacycle Intermediates in Polyethylene Chain Growth Using Homogeneous Chromium Catalysts

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journal contribution
posted on 27.07.2005, 00:00 authored by Atanas K. Tomov, Juan J. Chirinos, David J. Jones, Richard J. Long, Vernon C. Gibson
Deuterio-ethylene labeling studies on two homogeneous chromium ethylene oligomerization catalysts show that chain propagation proceeds via metallacyclic intermediates; reactions performed in the presence of 1-nonene show no incorporation of the higher olefin, strongly implicating the involvement of large ring metallacycles.