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dc.contributor.authorDingwall, Paul
dc.contributor.authorFuentes, José A.
dc.contributor.authorCrawford, Luke
dc.contributor.authorSlawin, Alexandra Martha Zoya
dc.contributor.authorBuehl, Michael
dc.contributor.authorClarke, Matthew L
dc.date.accessioned2018-10-24T23:50:08Z
dc.date.available2018-10-24T23:50:08Z
dc.date.issued2017-11-08
dc.identifier.citationDingwall , P , Fuentes , J A , Crawford , L , Slawin , A M Z , Buehl , M & Clarke , M L 2017 , ' Understanding a hydroformylation catalyst that produces branched aldehydes from alkyl alkenes ' Journal of the American Chemical Society , vol. 139 , no. 44 , pp. 15921–15932 . https://doi.org/10.1021/jacs.7b09164en
dc.identifier.issn0002-7863
dc.identifier.otherPURE: 251350605
dc.identifier.otherPURE UUID: f4931072-3b63-4e1a-b262-d06ccfbab29b
dc.identifier.otherScopus: 85033220139
dc.identifier.otherORCID: /0000-0002-1095-7143/work/48131743
dc.identifier.otherORCID: /0000-0002-9527-6418/work/56861737
dc.identifier.otherORCID: /0000-0002-2444-1244/work/59464622
dc.identifier.otherWOS: 000415028200054
dc.identifier.urihttp://hdl.handle.net/10023/16318
dc.descriptionThe authors thank the EPSRC for funding (EP/M003868/1).en
dc.description.abstractThis paper reports experimental and computational studies on the mechanism of a rhodium-catalysed hydroformylation that is selective for branched aldehyde products from unbiased alkene substrates. This highly unusual selectivity relies on a phospholane-phosphite ligand prosaically called BOBPHOS. Kinetic studies using in situ high pressure IR (HPIR) and the reaction progress kinetic analysis methodology suggested two steps in the catalytic cycle were involved as turnover determining. Negative order in CO and positive orders in alkene and H2 were found and the effect of hydrogen and carbon monoxide partial pressures on selectivity were measured. Labelling studies found rhodium hydride addition to the alkene to be largely irreversible. Detailed spectroscopic HPIR and NMR characterization of activated rhodium-hydrido dicarbonyl species were carried out. In the absence of H2, reaction of the rhodium-hydrido dicarbonyl with allylbenzene allowed further detailed spectroscopic characterization of four- and five-coordinate rhodium-acyl species. Under single-turnover conditions the ratios of branched to linear acyl species were preserved in the final ratios of aldehyde products. Theoretical investigations uncovered unexpected stabilizing CH-π interactions between the ligand and substrate which influenced the high branched selectivity by causing potentially low energy pathways to become unproductive. Energy span and degree of TOF control analysis strongly support experimental observations and mechanistic rationale. A three-dimensional quadrant model was built to represent the structural origins of regio- and enantioselectivity.
dc.language.isoeng
dc.relation.ispartofJournal of the American Chemical Societyen
dc.rightsCopyright © 2017 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/jacs.7b09164en
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subject.lccQDen
dc.titleUnderstanding a hydroformylation catalyst that produces branched aldehydes from alkyl alkenesen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1021/jacs.7b09164
dc.description.statusPeer revieweden
dc.date.embargoedUntil2018-10-25
dc.identifier.urlhttp://pubs.acs.org/doi/suppl/10.1021/jacs.7b09164en


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