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Triosmium Alkylidyne Clusters containing Monophosphine and Chiral Diphosphine Ligands. Crystal and Molecular Structures of and (R)->

DOI: 10.1039/DT9950002831

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2831 - 2836 (1995)

Update date:2022-08-04

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Authors:

Wong, Wai-YeungWong, Wai-Yeung

Wong, Wing-TakWong, Wing-Tak

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Article abstract of DOI:10.1039/DT9950002831

The cluster reacted with excess of butyldiphenylphosphine, in the presence of 1,8-diazabicyclo<5.4.0>undec-7-ene (dbu), to give the complex 1.The optically active diphosphine (R)-Ph2PCH(Me)CH2PPh2 reacted similarly to give two isomers, (R)-> 2a and (R)-> 2b, which have been spectroscopically characterised.Complex 2a readily undergoes decarbonylation, followed by the formation of Os-P bond, to afford an octacarbonyl chiral cluster complex (R)-> 3.The molecular structures of 1 and 3 have been established by X-ray crystallography.Complex 1 contains a triosmium alkylidyne metal core with the n-BuPh2P moiety bonded to the apical carbon atom through the phosphorus atom.On the other hand, the structure of 3, which also contains a phosphine-substituted μ3-C ligand bonded to three osmium atoms at the base, is characterised by the formation of a six-membered osmacycle with the centre of chirality being retained in the phosphine ligand of the complex.

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