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dc.contributor.authorAhmad, Shahbaz
dc.contributor.authorBuehl, Michael
dc.date.accessioned2020-08-13T23:36:38Z
dc.date.available2020-08-13T23:36:38Z
dc.date.issued2019-09-06
dc.identifier.citationAhmad , S & Buehl , M 2019 , ' Design of a highly active Pd catalyst with P,N hemilabile ligands for alkoxycarbonylation of alkynes and allenes : a density functional theory study ' , Chemistry - A European Journal , vol. 25 , no. 50 , pp. 11625-11629 . https://doi.org/10.1002/chem.201902402en
dc.identifier.issn0947-6539
dc.identifier.otherPURE: 259680425
dc.identifier.otherPURE UUID: 277a52dc-ddac-4f4c-b144-3a7cb563dc75
dc.identifier.otherORCID: /0000-0002-1095-7143/work/60630500
dc.identifier.otherScopus: 85070957017
dc.identifier.otherWOS: 000481245000001
dc.identifier.urihttp://hdl.handle.net/10023/20461
dc.descriptionAuthors thanks EaStCHEM and the School of Chemistry for support.en
dc.description.abstractIn palladium-catalysed methoxycarbonylation of technical propyne, the presence of propadiene poisons the hemilabile Pd(P,N) catalyst. According to density functional theory calculations (B3PW91-D3/PCM level), a highly stable π-allyl intermediate is the reason for this catalyst poisoning. Predicted regioselectivities suggest that at least 11% of propadiene should yield this allyl intermediate, where the reaction gets stalled under the turnover conditions due to an insurmountable methanolysis barrier of 25.8 kcal mol-1. Results obtained for different ligands and substrates are consistent with the available experimental data. A new ligand, (6-Cl-3-Me-Py)PPh2, is proposed, which is predicted to efficiently control the branched/linear selectivity, avoiding rapid poisoning (with only 0.2% of propadiene being trapped as Pd allyl complex), and to tremendously increase the catalytic activity by decreasing the overall barrier to 9.1 kcal mol-1.
dc.language.isoeng
dc.relation.ispartofChemistry - A European Journalen
dc.rightsCopyright © 2019 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim. 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 may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/chem.201902402en
dc.subjectHomogeneous catalysisen
dc.subjectDFT computationsen
dc.subjectReaction mechanismsen
dc.subjectRational ligand designen
dc.subjectQD Chemistryen
dc.subjectDASen
dc.subjectBDCen
dc.subject.lccQDen
dc.titleDesign of a highly active Pd catalyst with P,N hemilabile ligands for alkoxycarbonylation of alkynes and allenes : a density functional theory studyen
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/10.1002/chem.201902402
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-08-14


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