Highly selective oxidation of amines to imines by Mn2O3 catalyst under eco-friendly conditions |
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| Authors: | Fushan Chen Tao Yang Songlin Zhao Taotao Jiang Lu Yu Houfeng Xiong Chuankun Guo Yufang Rao Yan Liu Liu Liu Jian Zhou Pengxiang Tu Jun Ni Qunfeng Zhang Xiaonian Li |
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| Affiliation: | Industrial Catalysis Institute of Zhejiang University of Technology, Hangzhou 310014, China; Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang University, Jiujiang 332005, China; School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, China |
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| Abstract: | Enhancing the selectivity of imines for the oxidative self-coupling of primary amines was found to be challenging in the heterogeneous catalysis. Three different manganese oxides (M-3, M-4, M-5) were synthesized by controlling the calcination temperature using a simple template-free oxalate route. The prepared manganese oxides were systematically characterized using XRD, N2 sorption, SEM, TEM, XPS, H2-TPR techniques. M-4 gave 96.2% selectivity of imine at 100% conversion of benzylamine, which was far more superior than other existing protocols. Mn3+/Mn4+ ratio was found to affect the selectivity of the imines. The probable reaction pathway for amines oxidation catalyzed by manganese oxides was proposed for the first time. |
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| Keywords: | Oxalate route Mn2O3 Self-coupling of amines Heterogeneous catalysis Aerobic oxidation |
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