title: PCNCP ligands in the chromium-catalyzed oligomerization of ethylene: tri- versus tetramerization.
abstract: Chromium(III) complexes bearing R'N(CH2PR2)2 (PCNCP) ligands have been prepared. Upon activation with methylaluminoxane, these complexes proved to be effective in the selective tri- and tetramerization of ethylene. The formation of either 1-hexene or 1-octene was found to be highly dependent on the steric bulk of the substituents R on the phosphine moieties. This observation was rationalized by using density functional theory calculations on selected steps of the metallacyclic mechanism of the ethylene oligomerization reaction.
authors.affiliation: Laboratoire Hétéroéléments et Coordination, Ecole Polytechnique-CNRS, 91128 Palaiseau cedex, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Klemps
authors.forename: Elina
authors.initials: E
authors.lastname: Payet
authors.forename: Lionel
authors.initials: L
authors.lastname: Magna
authors.forename: Lucien
authors.initials: L
authors.lastname: Saussine
authors.forename: Xavier F
authors.initials: XF
authors.lastname: Le Goff
authors.forename: Pascal
authors.initials: P
authors.lastname: Le Floch