期刊
TETRAHEDRON
卷 61, 期 41, 页码 9670-9678出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2005.07.098
关键词
palladacycle; reductive elimination; mechanism, cyclic voltammetry
In DMF at 80 degrees C, a Pd-0 complex is generated in situ from the dimeric P,C-palladacycle (1) in the absence of any reducing agents, presumably via a reductive elimination. The Pd-0 complex formed in an endergonic equilibrium has been trapped and stabilized by an additional P(o-Tol)(3) and has been detected in cyclic voltammetry by its oxidation peak. Its formation is favored by acetate anions (often used as base in Heck reactions) via the formation of a monomeric anionic P,C-palladacycle ligated by acetate ions. As postulated, P,C-palladacycles are a reservoir of monophosphine-Pd-0 complexes active in oxidative additions with aryl halides. (c) 2005 Elsevier Ltd. All rights reserved.
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