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Michael Troupel Yolande Rollin Soline Sibille Jacques Perichon Jean-François Fauvarque 《Journal of organometallic chemistry》1980,202(4):435-446
In mixed THF/HPMA, electrochemical reduction of NiX2L2 (L = PPh3, X = Cl or Br) yields a zerovalent nickel complex which reacts very rapidly with ArX (X = I, Br, Cl) by oxidative addition to give ArNiXL2, which also is electroreducible. Thus it is possible to obtain a catalytic electroreduction of ArX which affords mainly biaryls when X = Cl. A mechanism is suggested according the various results especially with a view to explain the loss of catalytic activity. A clear indication of increasing activity is given when aliphatic bromides are added to the solutions. 相似文献
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Karine Varlot Jean-Michel Martin Christian Quet Yolande Kihn 《Macromolecular Symposia》1997,119(1):317-324
We have performed EELS analysis of poly (ethylene terephthalate) (PET) in the analytical TEM in order to evaluate the possibility to obtain chemical analysis of the polymer at sub-micrometer scale. Due to irradiation damage, it revealed necessary to work at the lowest possible electron dose, typically below 103 C.m−2, and with the specimen cooled to liquid nitrogen temperature. In the acquired spectra, we propose an identification of the different chemical bondings in agreement with XANES experiments. 相似文献