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Metal-free nitrogen -doped carbon nanosheets: a catalyst for the direct synthesis of imines under mild conditions

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Abstract

Herein, a highly stable, porous, multifunctional and metal-free catalyst was developed, which exhibited significant catalytic performance in the oxidation of amines and transfer hydrogenation of nitriles under mild conditions; this could be attributed to the presence of numerous active sites and their outstanding BET surface area. The obtained results showed that most of the yields of imines exceeded 90%, and the cycling performance of the catalyst could be at least seven runs without any decay in the reaction activity, which could be comparable to those of metal catalysts. Subsequently, a kinetic study has demonstrated that the apparent activation energy for the direct synthesis of imines from amines is 67.39 kJ mol−1, which has been performed to testify that the catalytic performances are rational. Via catalyst characterizations and experimental data, graphitic-N has been proven to be the active site of the catalyst. Hence, this study is beneficial to comprehend the mechanism of action of a metal-free N-doped carbon catalyst in the formation of imines.

Graphical abstract: Metal-free nitrogen -doped carbon nanosheets: a catalyst for the direct synthesis of imines under mild conditions

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Publication details

The article was received on 16 Mar 2019, accepted on 21 Mar 2019 and first published on 03 Apr 2019


Article type: Paper
DOI: 10.1039/C9GC00908F
Citation: Green Chem., 2019, Advance Article

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    Metal-free nitrogen -doped carbon nanosheets: a catalyst for the direct synthesis of imines under mild conditions

    K. Wang, P. Jiang, M. Yang, P. Ma, J. Qin, X. Huang, L. Ma and R. Li, Green Chem., 2019, Advance Article , DOI: 10.1039/C9GC00908F

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