Aryl couplings with heterogeneous palladium catalysts
作者:Guy Marck、Alois Villiger、Richard Buchecker
DOI:10.1016/s0040-4039(00)76884-5
日期:1994.5
The coupling reaction of diverse phenylboronic acids with aryl halogenides and -triflates has been performed by the use of simple palladium hydrogenation catalysts. Evidence for a heterogeneous type of catalysis has been obtained.
Synthesis, mesomorphic behaviour and optical anisotropy of some novel materials for nematic mixtures of high birefringenceElectronic supplementary information (ESI) available: experimental procedures for all compounds not already given in this paper. See http://www.rsc.org/suppdata/jm/b4/b400630e/
作者:Michael Hird、Kenneth J. Toyne、John W. Goodby、George W. Gray、Victoria Minter、Rachel P. Tuffin、Damien G. McDonnell
DOI:10.1039/b400630e
日期:——
Structural moieties including core units (such as phenyl, naphthyl and thiophenyl), linking groups (such as ethynyl), terminal substituents (such as cyano, isothiocyanato and fluoro), and lateral fluoro substituents have been incorporated into novel materials designed to confer a high birefringence on nematic mixtures. The materials have all been prepared through convergent syntheses involving palladium-catalysed cross-coupling reactions of arylboronic acids. The materials were examined for their mesomorphic behaviour as neat materials and as mixtures; some materials were found to have extremely high nematic phase stability, and others were non-mesogenic. The materials were evaluated in nematic host mixtures for their optical anisotropy, and they were all found to show promisingly high values.
Palladium-catalyzed Suzuki cross-coupling reactions in a microemulsion
作者:Valery Vashchenko、Alexander Krivoshey、Irina Knyazeva、Alexey Petrenko、John W. Goodby
DOI:10.1016/j.tetlet.2008.01.013
日期:2008.2
An enhancement of palladium-catalyzedSuzukicross-coupling reactions between substrates possessing long-chain alkyl or oxyalkyl substituents in two-phase media, in the presence of sodium dodecylsulfate, is shown. Quantitative evaluations of the influence of SDS on the reaction rates were determined.