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Issue 11, 2004
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Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts

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Abstract

The dinuclear complex [Co2(CO)6{P(OPh)3}2] (2) has been synthesised and was fully characterised. The solid state structure revealed a trans diaxial geometry, no bridging carbonyls, and Co–Co and Co–P bond lengths of 2.6722(4) and 2.1224(4) Å, respectively. Catalysed hydroformylation of 1-pentene with 2 was attempted at temperatures in the range 120 to 210 °C and pressures between 34 and 80 bar. High pressure spectroscopy (HP-IR and HP-NMR) was used to detect hydride intermediates. High pressure infrared (HP-IR) studies revealed the formation of [HCo(CO)3P(OPh)3] (4) at ca. 110 °C, but at higher temperatures absorption bands corresponding to [HCo(CO)4] (3) were observed. The hydride intermediate 4 has also been synthesised and characterised. Upon increased ligand concentration, HP-IR studies showed the formation of new carbonyl absorption bands due to a higher substituted cobalt carbonyl complex-[HCo(CO)2{P(OPh)3}2] (5), which is believed to be catalytically less active. Complex 5 has been synthesised independently and was fully characterised. A low temperature crystal structural study of 5 revealed a trigonal bipyramidal structure with a trans H–Co–CO arrangement and two equatorial phosphite ligands, the Co–P bond lengths being 2.1093(8) and 2.1076(8) Å, respectively.

Graphical abstract: Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts

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Publication details

The article was received on 27 Feb 2004, accepted on 21 Apr 2004 and first published on 10 May 2004


Article type: Paper
DOI: 10.1039/B403033H
Citation: Dalton Trans., 2004,0, 1679-1686
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    Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts

    M. Haumann, R. Meijboom, J. R. Moss and A. Roodt, Dalton Trans., 2004, 0, 1679
    DOI: 10.1039/B403033H

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