The catalytic activity of the heterogeneous catalysts of Mn-mont (where mont represents montmorillonite) coordinated with Schiff-base ligands for epoxidation of cyclohexene by O2 under Mukaiyama conditions was studied. The catalysts were characterized by IR, UV-vis DRS, XRD, SEM and ICP. The heterogeneous catalysts were proved to promote the epoxidation of cyclohexene efficiently, the effects of various reaction conditions on the catalytic reaction were optimized and obtained as high as 100% conversion with 90.0% selectivity of epoxycyclohexane at 40 °C in 5 h with molecular oxygen as oxidant in acetonitrile. Repeated runs indicated that the catalysts were stable for at least 3 cycles. Thus, the heterogeneous catalysts of Mn-mont coordinated with Schiff-base ligands were proved to be environmentally friendly and economical for the epoxidation of cyclohexene.
研究了与席夫碱
配体配位的 Mn-mont(其中 mont 代表
蒙脱石)异相催化剂在 Mukaiyama 条件下催化 O2
环己烯环氧化的催化活性。催化剂的表征方法包括红外光谱、紫外可见 DRS、X 射线衍射、扫描电镜和 ICP。通过优化各种反应条件对催化反应的影响,证明了异相催化剂能有效促进
环己烯的环氧化反应,并以分子氧为氧化剂,在
乙腈中催化反应 5 小时,在 40 ℃ 条件下,环氧
环己烷的转化率高达 100%,选择性为 90.0%。重复运行表明,催化剂至少在 3 个循环中保持稳定。因此,在
环己烯的环氧化反应中,与希夫碱
配体配位的
锰单质异相催化剂被证明是一种环境友好且经济的催化剂。