Arenediazonium tetrachlorocuprates(II). Modification of the Meerwein and Sandmeyer reactions
作者:Mykola D. Obushak、Mykhaylo B. Lyakhovych、Mykola I. Ganushchak
DOI:10.1016/s0040-4039(98)02165-0
日期:1998.12
In the copper-catalysed reactions of arenediazonium chlorides with unsaturated compounds arenediazonium tetrachlorocuprates(II) are formed as intermediates. A general method of preparation of these complexed diazonium salts is described. In polar solvents these salts undergo chlorinative dediazoniation to give chloroarenes in high yield. The reaction of an arenediazonium tetrachlorocuprate(II) with
Über die Umsetzung von Acrylsäurenitril mit aromatischen Diazoniumsalzen
作者:W. H. Brunner、H. Perger
DOI:10.1007/bf00899393
日期:1948.5
Titanium Tetrachloride-Mediated Carbon-Carbon Chlorocyanoethylation of Anisole: Synthesis of Tyrosine Derivatives
作者:Braja G. Hazra、Vandana S. Pore、Sourav Basu
DOI:10.1080/00397919508011832
日期:1995.9
Abstract Chlorocyanoethylation of anisole with 2-chloroacrylonitrile in presence of titanium tetrachloride furnished α-chloro-β-(4-methoxyphenyl)propionitrile. This on simple reaction sequence was converted to (±) methyl-α-amino-β-(4-methoxyphenyl)propionate, a tyrosine derivative.
Chloroarylation of unsaturated compounds with arenediazonium chlorides in the presence of CuCl2 as catalyst involves intermediate formation of arenediazonium tetrachlorocuprates(II) [ArN2+](2) CuCl42-. A procedure for preparative isolation of these intermediates was developed, and they were shown to be efficient arylating agents. Reactions of [ArN2+](2) CuCl42- with unsaturated compounds gave the corresponding Meerwein products; a mechanism was proposed for these reactions. In polar solvents arenediazonium tetrachlorocuprates(II) are converted into chloroarenes, presumably through a cyclic transition state.