期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 330, 期 1-2, 页码 18-25出版社
ELSEVIER
DOI: 10.1016/j.molcata.2010.06.026
关键词
Hydroxycarbonylation; Hydrocarbonylation; Hydroesterification; Suzuki coupling; Palladium
资金
- EPSRC
- SASOL Technology (UK)
The reactions of the very bulky phosphine ligands containing both tert-butyl and ortho-trifluoromethylphenyl substituents with [PdCl2(PhCN)(2)] have been studied, in order to assess the impact of steric and electronic effects on a ligand's coordination ability. The palladium complexes of tert-butyl(ortho-trifluoromethylphenyl)methyl phosphine and tert-butyl(ortho-trifluoromethylphenyl)(n-butyl)phosphine were characterised by X-ray crystallography and shown to be good precatalysts for the hydroxy- and alkoxycarbonylation of alkenes relative to Pd complexes of tricyclohexylphosphine and triphenylphosphine. A notable feature of Pd complexes of tert-butyl(ortho-trifluoromethylphenyl)methyl phosphine is significantly enhanced regioselectivity relative to previous state-of-the-art catalysts in the hydroxycarbonylation of styrene, even if lithium chloride co-catalysts are not used. These catalysts derived from large cone angle ligands consistently give higher regioselectivity in the alkoxycarbonylation of styrene using ethanol, n-propanol, and i-propanol as nucleophiles. These Pd complexes are also active in the Suzuki coupling of activated aryl chlorides, and in both carbonylation and Suzuki reactions, tertbutyl(ortho-trifluoromethylphenyl)methyl phosphine gives more productive catalysts than its bulkier analogues. (C) 2010 Elsevier B.V. All rights reserved.
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