Highly Active [Pd(μ‐Cl)Cl(NHC)]
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Complexes in the Mizoroki–Heck Reaction
作者:Ulrike I. Tessin、Xavier Bantreil、Olivier Songis、Catherine S. J. Cazin
DOI:10.1002/ejic.201300169
日期:2013.4.12
A series of Pd dimers bearing an N-heterocyclic carbene ligand was studied in the Mizoroki–Heckreaction. [Pd(μ-Cl)Cl(SIPr)]2 (SIPr = N,N′-bis[2,6-(diisopropyl)phenyl]imidazolidin-2-ylidene}) was shown to be highly efficient in this cross-coupling for a range of aryl and heterocyclic bromides, with low palladium loading (20–200 ppm).
Pd-TPPTS catalyzed Mizoroki–Heck coupling in halogen-free ionic liquids [Rmim][p-CH3C6H4SO3]
作者:Juan Wei、Hai-Yan Fu、Rui-Xiang Li、Hua Chen、Xian-Jun Li
DOI:10.1016/j.catcom.2011.01.008
日期:2011.3
A highly efficient system composed of Pd-TPPTS [TPPTS: trisodium salt of tri(m-sulphonylphenyl)phosphine] and halogen-free ionic liquid ([Rmim][p-CH3C6H4SO3), R = methyl, ethyl, n-butyl, n-hexyl, n-octyl, n-dodecyl) has been established for Heck coupling of aryl halides with styrene. Most of the investigated substrates could give the complete conversions (> 95%) with the catalyst of 1 mol% at 110 degrees C. The resulting products can be easily separated from the ionic liquids by simple liquid-liquid extraction, and the catalyst immobilized by ionic liquids can be consecutively run five times without significant loss in catalytic activity. (c) 2011 Elsevier B.V. All rights reserved.
Ligand and base-free Heck reaction with heteroaryl halides
Pd(CH3CN)(2)Cl-2-catalyzed I-leek reaction of different heteroaryl halides with olefins is carried out in the absence of both the ligand and base to obtain the corresponding coupling products in good yields. (C) 2011 Elsevier Ltd. All rights reserved.