Issue 15, 2002

Transition metal complexes of triphosphorus macrocycles: A new class of homogeneous olefin polymerisation catalysts

Abstract

Some early transition metal (Ti, V, Cr) complexes of the triphosphorus macrocycle 1,5,9-triethyl-1,5,9-triphosphacyclododecane, [12]aneP3Et3, and related derivatives [12]aneP3R3 (R = Ph, C3H6OMe) have been examined for their reactivity towards ethene and propene. All complexes of the type [12]aneP3Et3MCl3 display moderate catalytic activity in the homogeneous polymerisation of ethene when combined with an alkyl aluminium co-catalyst to give very high molecular weight polymers. Preliminary activation of chromium complexes with alkylating agents was also studied but these were inactive in the absence of a co-catalyst. Substitution of the P-borne alkyl group with a pendant ether function was found to switch the catalytic activity of chromium(III) complexes from polymerisation to oligomerisation. A nickel halide complex of [12]aneP3Et3 was also found to be active in alkene polymerisation.

Graphical abstract: Transition metal complexes of triphosphorus macrocycles: A new class of homogeneous olefin polymerisation catalysts

Article information

Article type
Paper
Submitted
25 Mar 2002
Accepted
11 Jun 2002
First published
05 Jul 2002

J. Chem. Soc., Dalton Trans., 2002, 2960-2965

Transition metal complexes of triphosphorus macrocycles: A new class of homogeneous olefin polymerisation catalysts

R. J. Baker and P. G. Edwards, J. Chem. Soc., Dalton Trans., 2002, 2960 DOI: 10.1039/B203002K

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