We have studied the balance between olefin insertion and beta -hydrogen transfer to monomer for all "well-defined" aluminum polymerization catalysts reported to date. Consistently, the balance is predicted to be significantly worse than for Me2AlEt, implying that none of the proposed active species, should give a high-molecular-mass polymer. A more systematic analysis of ligand effects allows a rationalization of these results and shows that small modifications to the proposed active species are unlikely to solve the problem. We conclude that olefin polymerization at a single aluminum center is, rather unlikely. Alternative interpretations of the experimental data are discussed.
Olefin polymerization at aluminium? A theoretical study / Talarico, Giovanni; Busico, V; Budzelaar, Petrus Henricus Maria. - In: ORGANOMETALLICS. - ISSN 0276-7333. - STAMPA. - 20:(2001), pp. 4721-4726. [10.1021/om010696k]
Olefin polymerization at aluminium? A theoretical study
TALARICO, GIOVANNI
;BUDZELAAR, Petrus Henricus Maria
2001
Abstract
We have studied the balance between olefin insertion and beta -hydrogen transfer to monomer for all "well-defined" aluminum polymerization catalysts reported to date. Consistently, the balance is predicted to be significantly worse than for Me2AlEt, implying that none of the proposed active species, should give a high-molecular-mass polymer. A more systematic analysis of ligand effects allows a rationalization of these results and shows that small modifications to the proposed active species are unlikely to solve the problem. We conclude that olefin polymerization at a single aluminum center is, rather unlikely. Alternative interpretations of the experimental data are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.