论文部分内容阅读
研究了以Pd(OAc)2为催化剂,H3PMo12O40为助催化剂,空气为氧化剂,在乙酸溶液中于373K条件下,在500ml高压釜中由苯液相氧化偶联合成联苯.结果表明,反应产物中联苯的选择性高达92%以上,并且只有少量的三联苯副产物生成. 分别考察了H3PMo12O40的加入量和O2分压对以空气或纯O2为氧化剂时Pd/HPMo/AcOH催化苯液相氧化偶联合成联苯反应催化性能的影响.根据反应液颜色的变化以及文献结果推测,在反应过程中通过钯和钼物种的氧化和还原作用使苯氧化生成联苯.
In this paper, biphenyls were synthesized by the liquid phase oxidation of benzene with Pd (OAc) 2, H3PMo12O40 as cocatalyst and air as oxidant in acetic acid solution at 373K in a 500ml autoclave. The results showed that the reaction product The selectivity of biphenyl was above 92%, and only a small amount of terphenyl byproduct was formed.Hydrogen peroxydation of H3PMo12O40 and partial pressure of O2 were investigated separately for Pd / HPMo / AcOH catalyzed benzene liquid phase with air or pure O2 as oxidant Oxidative Coupling Synthesis of Biphenyl Reaction Catalytic Properties: According to the color change of the reaction solution and the literature results, it is presumed that the oxidation of benzene and molybdenum species and the reduction of the molybdenum species during the reaction lead to the oxidation of benzene to biphenyl.