Application of polymer immobilized Cu(II)(PS-Cu(II)PBMZL) complex of 2-phenylbenzimidazole in oxidative bromination and oxidative esterification of organic compounds is reported. The complex has been characterized by CHNS analysis, UV-Vis/DRS, FT-IR, ESR spectroscopic studies, magnetic moment measurements and TG analysis. A shift in νC=N in the polymer-bound complex compared with the ligand indicates its complexation to Cu(II) center. A distorted octahedral coordination of Cu(II) in PS-Cu(II)PBMZL is confirmed by the electronic spectral data and the efficient binding of PBMZL is ascertained by adecrease in the intensity of νCH2Cl peak in the PS-PBMZL compared to the polymer support. An array of experiments has been carried out to assess the influence of various reaction parameters on the performance of PS-Cu(II)PBMZL. The activity of the polymer-bound complex is higher than the unbound complex. In the case of oxidative bromination, PS-Cu(II)PBMZLH displayed a 65% phenol conversion with 61% 2-bromophenol selectivity. The % benzaldehyde conversion and methyl benzoate selectivity in the case of oxidative esterification has been found to be 79 and 82%. Compiling all these results along with the knowledge obtained regarding the most probable reactive species, tentative mechanisms have been proposed.

中文翻译：

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2-苯基苯并咪唑的聚合物键合Cu(II)配合物在有机底物氧化溴化和氧化酯化中的应用

报道了 2-苯基苯并咪唑的聚合物固定化 Cu(II)(PS-Cu(II)PBMZL) 配合物在有机化合物的氧化溴化和氧化酯化中的应用。该复合物已通过 CHNS 分析、UV-Vis/DRS、FT-IR、ESR 光谱研究、磁矩测量和 TG 分析表征。与配体相比，聚合物结合复合物中 νC=N 的变化表明其与 Cu(II) 中心络合。电子光谱数据证实了 PS-Cu(II)PBMZL 中 Cu(II) 的扭曲八面体配位，并且与聚合物载体相比，PS-PBMZL 中 νCH2Cl 峰的强度降低确定了 PBMZL 的有效结合. 已经进行了一系列实验来评估各种反应参数对 PS-Cu(II)PBMZL 性能的影响。聚合物结合的复合物的活性高于未结合的复合物。在氧化溴化的情况下，PS-Cu(II)PBMZLH 显示出 65% 的苯酚转化率和 61% 的 2-溴苯酚选择性。已发现在氧化酯化的情况下苯甲醛转化率和苯甲酸甲酯选择性为 79% 和 82%。将所有这些结果与获得的关于最可能的反应物种的知识一起汇总，已经提出了暂定机制。