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

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dc.contributor.authorHaumann, Marco
dc.contributor.authorMoss, John R
dc.contributor.authorMeijboom, Reinout
dc.contributor.authorRoodt, Andreas
dc.date.accessioned2016-01-19T12:25:52Z
dc.date.available2016-01-19T12:25:52Z
dc.date.issued2004
dc.date.updated2016-01-19T07:38:45Z
dc.description.abstractThe 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.en_ZA
dc.identifierhttp://dx.doi.org/10.1039/B403033H
dc.identifier.apacitationHaumann, M., Moss, J. R., Meijboom, R., & Roodt, A. (2004). Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts. <i>Dalton Transactions</i>, http://hdl.handle.net/11427/16438en_ZA
dc.identifier.chicagocitationHaumann, Marco, John R Moss, Reinout Meijboom, and Andreas Roodt "Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts." <i>Dalton Transactions</i> (2004) http://hdl.handle.net/11427/16438en_ZA
dc.identifier.citationHaumann, M., Meijboom, R., Moss, J. R., & Roodt, A. (2004). Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts. Dalton Transactions, (11), 1679-1686.en_ZA
dc.identifier.issn1477-9226en_ZA
dc.identifier.ris TY - Journal Article AU - Haumann, Marco AU - Moss, John R AU - Meijboom, Reinout AU - Roodt, Andreas AB - 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. DA - 2004 DB - OpenUCT DP - University of Cape Town J1 - Dalton Transactions LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 SM - 1477-9226 T1 - Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts TI - Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts UR - http://hdl.handle.net/11427/16438 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/16438
dc.identifier.vancouvercitationHaumann M, Moss JR, Meijboom R, Roodt A. Synthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalysts. Dalton Transactions. 2004; http://hdl.handle.net/11427/16438.en_ZA
dc.languageengen_ZA
dc.publisherRoyal Society of Chemistryen_ZA
dc.publisher.departmentDepartment of Chemistryen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceDalton Transactionsen_ZA
dc.source.urihttp://pubs.rsc.org/en/journals/journalissues/dt?e=1#!recentarticles&all
dc.titleSynthesis, crystal structure and hydroformylation activity of triphenylphosphite modified cobalt catalystsen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordscobalt catalystsen_ZA
uct.subject.keywordsSynthesisen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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