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Metal-free nanodiamond catalyst for alcohol–amine oxidative coupling to imine

Shaolin Shi, Huanshi Lan, Chenfa Tao, Ying Zhang, Hao Zhang, Qingdi Sun, Xingcong Zhang, Guanghui Guo, Qian He, Xiaohui He, and Hongbing Ji

School of Chemistry and Chemical Engineering, Guangxi University, Nanning, China



Received: 2 November 2022  Accepted: 2 February 2023


Metal-free catalyst in imine synthesis was a great challenge due to the continuous rise in metal prices and unfriendly massive mining of metal. Herein, sp2/sp3 hybridization nanodiamond–graphene (ND@G) was obtained by simple heat treatment of the commercially nanodiamonds (ND) under argon atmosphere, the as-prepared catalyst showed excellent activity and selectivity for directly imine synthesis. The physical structure changes of nanodiamond before and after heat treatment were well-characterization, and it was found that the nanodiamond surface layer changed from disordered sp3 hybridized carbon to sp2/sp3 core–shell structure. This study demonstrates the possibility of using metal-free catalysts for imine synthesis by nanodiamond.

Keywords: Metal-free; Imines synthesis; Nanodiamonds; sp2/sp3 hybridization; Alcohol–amine oxidative coupling

Full paper is available at

DOI: 10.1007/s11696-023-02717-3


Chemical Papers 77 (6) 3495–3500 (2023)

Thursday, June 13, 2024

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