Amination of aryl bromides catalysed by supported palladium

被引:31
作者
Djakovitch, L [1 ]
Wagner, M [1 ]
Köhler, K [1 ]
机构
[1] Tech Univ Munich, Inst Anorgan Chem, D-85748 Garching, Germany
关键词
heterogeneous catalytic amination; metal oxides and zeolite supported palladium; aryl halides;
D O I
10.1016/S0022-328X(99)00518-5
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Palladium particles immobilised onto a metal oxide support or Pd(0), Pd(II) and [Pd(NH3)(4)](2+) in NaY zeolite have been prepared and characterised. They exhibit a good activity towards the amination of aryl bromides using secondary amines such as piperidine and diethyl amine with a good regio-selectivity for these reactions. Low Pd concentrations (1 mol%) are required to observe a reasonable regio-selectivity. The catalysts can easily be separated from the reaction mixture (filtration) and reused without loss of activity and selectivity. The electronic nature of the aryl halides plays an important role for both the reaction yields and the regio-control of the reaction. It depends on the relation of the direct amination via a benzyne intermediate versus the Pd-catalysed route. (C) 1999 Elsevier Science S.A. All rights reserved.
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页码:225 / 234
页数:10
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