Steric control of the chromium-catalyzed oligomerization of ethylene

Authors
Dohring, A Jensen, VR Jolly, PW Thiel, W Weber, JC
Citation
A. Dohring et al., Steric control of the chromium-catalyzed oligomerization of ethylene, MACRO SYMP, 173, 2001, pp. 117-121
Citations number
5
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR SYMPOSIA
ISSN journal
10221360 → ACNP
Volume
173
Year of publication
2001
Pages
117 - 121
Database
ISI
SICI code
1022-1360(200107)173:<117:SCOTCO>2.0.ZU;2-B
Abstract
Catalysts for the oligomerization and polymerization of ethylene have been obtained by activating phosphinoalkyl-substituted cyclopentadienyl chromium complexes, e.g. (eta (1),eta (5)-R2PC2H4C5H4)CrCl2, with methylalumoxane ( MAO). DFT-calculations indicate that the observed dependence of the degree of oligomerization upon the size of the substituents (R) on the P-donor ato m is a result of a steric influence on the stability of the transition stat e for the chain termination step.