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Aprotic Amine-modified Manganese Dioxide Catalysts for Selectivity-tunable Oxidation of Amines |
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| Authors: | Qianqian Hao Xiuquan Jia Dr Jiping Ma Mingxia Gao Xiaomeng Fan Jin Gao Prof Jie Xu |
| Institution: | 1. Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P. R. China;2. State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P. R. China;3. State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P. R. China University of Chinese Academy of Sciences, Beijing, 100049 P. R. China |
| Abstract: | Organic modifiers have shown promising potential for regulating the activity and selectivity of heterogeneous catalysts via tuning their surface properties. Despite the increasing application of organic modification technique in regulating the redox-acid catalysis of metal oxides, control of the acidity of metal oxide catalysts for enhanced reaction selectivity without sacrificing their redox activity remains a substantial challenge. Herein, we show the successful control of redox-acid catalysis of metal oxides with aprotic tertiary amine modifiers. Robust modification of manganese dioxide catalysts with N,N-dialkylcyclohexylamine selectively blocks the Lewis acid sites, with their redox activity mostly unaffected. This enables efficient synthesis of imines in high to excellent selectivity via aerobic oxidation of structurally diverse aryl amines. |
| Keywords: | amines oxidation aprotic modifier imines manganese dioxide selectivity-tunable catalysis |