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cis- and trans-bis(1-phenyl-2,3,4,5-tetramethylphosphole)tetracarbonylmolybdenum( 0), [Mo(CO)(4)(tmpPh)(2)]. Syntheses and structures

Author(s): K. W. Muir, F. Y. Petillon, R. Rumin, P. Schollhammer, J. Talarmin

1-Phenyl-2,3,4,5-tetramethylphosphole reacts with [Mo(CO)(6)] to give the mono- and bis(phosphole) complexes [Mo(CO)(5)L] and cis- and trans-[Mo(CO)(4)L-2], where L=C4Me5PPh (tmpPh). The new complexes have been characterised by spectroscopic methods, supplemented by single-crystal X-ray analyses in the case of the bis(phosphole) isomers. The isomeric bis-tmpPh complexes show little evidence of the overcrowding which is thought to lengthen bonds and distort the metal coordination in the corresponding bis-PPh3 and bis-PCy3 isomers. The structural basis for the greater stability of the trans isomers is briefly considered: the cis --> trans isomerisation typically involves little change in the mean Mo-CO distance, whereas there is a marked shortening of the Mo-P bonds. (C) 2001 Elsevier Science B.V. All rights reserved.

Full version: Available here

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ISBN: 0022-328X
Publication Year: 2001
Periodical: Journal of Organometallic Chemistry
Periodical Number: 1-2
Volume: 622
Pages: 297-301
Author Address: