Mechanism of arylation of nucleophiles by aryllead triacetates. Part 1. Exclusion of a pathway involving aryl free radicals
作者:Jacqueline Morgan、John T. Pinhey
DOI:10.1039/p19930001673
日期:——
o-(Prop-2-enyloxy)phenyllead triacetate 6. which was obtained by treatment of the corresponding boronic acid with lead tetraacetate, has been shown to react with iodide and azide ions, 2,4,6-trimethylphenol, ethyl 2-oxocyclopentanecarboxylate, and the sodium salt of 2-nitropropane to give only those products which, in a formal sense, are derived by direct nucleophilic displacement of the Pb(OAc), group. The complete absence of 3-substituted dihydrobenzofurans among the products is strong evidence that aryl free radicals are not involved in the arylation reactions of aryllead triacetates.
On the exclusion of radical species in the ligand coupling reactions with pentavalent triarylbismuth derivatives
作者:Sbastien Combes、Jean-Pierre Finet
DOI:10.1016/s0040-4020(98)01148-x
日期:1999.3
The presence of aryl radical species in the course of arylationreactions with tri and pentavalent organobismuth compounds has been studied by the use of an internal-trap containing reagent: tris(2-allyloxyphenyl)bismuth and its diacetate. The intervention of radical species can be excluded in C- and O-arylation under basic conditions as well as in copper catalyzed O- and N-arylation, as cyclized products