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Highly selective chromium-based ethylene trimerisation catalysts with bulky diphosphinoamine ligands.

Blann, Kevin; Bollmann, Annette; Dixon, John T; Hess, Fiona M; Killian, Esna; Maumela, Hulisani; Morgan, David H; Neveling, Arno; Otto, Stephanus; Overett, Matthew J.

Chem Commun (Camb) ; (5): 620-1, 2005 Feb 07.

Article in English | MEDLINE | ID: mdl-15672155

ABSTRACT

In situ prepared chromium catalysts containing bulky diphosphinoamine (PNP) ligands, upon activation with MAO, are extremely efficient catalysts for the trimerisation of ethylene to 1-hexene.

Ethylene trimerisation and tetramerisation catalysts with polar-substituted diphosphinoamine ligands.

Overett, Matthew J; Blann, Kevin; Bollmann, Annette; Dixon, John T; Hess, Fiona; Killian, Esna; Maumela, Hulisani; Morgan, David H; Neveling, Arno; Otto, Stephanus.

Chem Commun (Camb) ; (5): 622-4, 2005 Feb 07.

Article in English | MEDLINE | ID: mdl-15672156

ABSTRACT

Chromium-based catalyst systems with polar-substituted diphosphinoamine ligands are selective for either trimerisation or tetramerisation of ethylene, depending on the position of the polar groups on the aryl rings.

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