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

Dalton Transactions : an International Journal of Inorganic Chemistry
Marco HaumannAndreas Roodt

Abstract

The dinuclear complex [Co(2)(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) Angstrom, respectively. Catalysed hydroformylation of 1-pentene with 2 was attempted at temperatures in the range 120 to 210 degrees 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)(3)P(OPh)3] (4) at ca. 110 degrees C, but at higher temperatures absorption bands corresponding to [HCo(CO)(4)]() 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...Continue Reading

Citations

Nov 18, 2011·Acta Crystallographica. Section E, Structure Reports Online·Ilana EngelbrechtAndreas Roodt
Jan 4, 2013·Acta Crystallographica. Section E, Structure Reports Online·Maryke SteynAndreas Roodt
Sep 13, 2012·Acta Crystallographica. Section E, Structure Reports Online·Ilana EngelbrechtAndreas Roodt
Aug 23, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Simon A LlewellynAndrew R Cowley
Aug 11, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Peter N Bungu, Stefanus Otto
Aug 15, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Clare HennionAndreas Roodt
Jun 28, 2007·Chemistry : a European Journal·Susan E GibsonAndrew J P White
Feb 3, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Maya GuillaumontHélène Gérard
Apr 9, 2021·Journal of the American Chemical Society·Mary C EatonLeslie J Murray

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