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Palladium complexes of C2-, C3-, and C4-bridged bis(phospholyl) ligands: Remarkably active catalysts for the copolymerization of ethylene and carbon monoxide

Lookup NU author(s): Dr Simon Doherty, Thomas Scanlan, Dr Mark Elsegood, Emeritus Professor Bill Clegg

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Abstract

The C2-, C3-, and C4-bridged bis(2,3,4,5-tetramethylphospholes) [{C(Me)C(Me)C(Me)C(Me)P}2X] (1a, X = C2H4; 1b, X = C3H6; 1c, X = (CH2)2C6H4) and their corresponding palladium complexes [(P-P)PdCl2] (2a-c) have been prepared and characterized. A single-crystal X-ray analysis of [{bis(2,3,4,5-tetramethylphospholyl)-o-xylene}PdCl2] (2c) reveals that 1c forms a seven-membered chelate; the phosphole rings are oriented perpendicular to the PdP2Cl2 plane. Methanol solutions of [(P-P)Pd(OAc)2] (3a, P-P = 1b; 3b, P-P = 1c) and methanesulfonic acid are active for the copolymerization of ethylene and carbon monoxide, generating high-molecular-weight polymers with narrow molecular weight distributions. Under our conditions, the activity of catalyst systems containing 1c is comparable to that based on bis(diphenylphosphino)propane (dppp).


Publication metadata

Author(s): Doherty S, Eastham GR, Tooze RP, Scanlan TH, Williams D, Elsegood MRJ, Clegg W

Publication type: Article

Publication status: Published

Journal: Organometallics

Year: 1999

Volume: 18

Issue: 18

Pages: 3558-3560

Print publication date: 06/08/1999

ISSN (print): 0276-7333

ISSN (electronic): 1520-6041

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/om990346m

DOI: 10.1021/om990346m


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