钯-邻菲啰啉体系在硝基苯还原羰基化中的催化性能

Catalytic Performance of Pattadium-phenanthroline Complexes in the Reductive Carbonylation of Nitrobenzene

本工作进一步研究Pd(Ⅲ)-phen 体系的催化性能。结果表明,钯盐或其配合物的阴离子对产物的选择性有很大影响。研究了 phen/Pd摩尔比、反应温度和CO压力对催化体系活性和选择性的影响,与PdCl_2-phen 体系不同,Pd(NO_3)_2-phen 体系在改变反应条件时,不能提高苯氨基甲酸酯的选择性。此外,本工作对PdCl_2-phen 均相催化剂固载化的效果进行了初步探讨。

It has been found that Palladium complexes with bidentate chelating ligand phenanthroline (phen) are very efficient catalysts for the reductive carbonylation of nitrobenzene in the presence of alcohols, to give the corresponding phenylurethanes. The observed results show that there is singificant influence of the anionic component of palladium calts or complexes on the catalytic selectivity to phenylurethane. The effects of phen/Pd mol ratio, reaction temperature and CO preessure on the activity and selectivity of the catalyst systems are investigated. In contrast to PdCl2-phen system, Pd(NO3)2-phen system will not be able to improve its PU selectivity when reaction conditions are changed. In this paper we also report a preliminary study of the behaviour of supported palladium comlex catalysts under conditions close to those used for analogous homogeneous catalysis.