Efficient and reusable catalysis of benzylic C-H oxidation over layered [Co5(OH)6]4+ derivatives
Wen Ma1, Chengdong Peng1, Xueling Song1
1Shanghai Key Laboratory of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Rd., Shanghai, 200092, P. R. China. fei@tongji.edu.cn.
Abstract:
Aerobic oxidation of benzylic C(sp3)-H bonds in a green and heterogeneous manner is a major target in organic catalysis. Herein, we report the synthesis of 3D coordination polymers containing [Co5(OH)6]4+ layers, affording reusable and efficient oxidation of ethylbenezene and tetralin by using O2 as the oxidant. Moreover, the cleavage of CoII-carboxylate bonding renders atomically thin cobaltate nanosheets and enhanced catalytic performance. This is one of the top catalytic performances for CoII-catalyzed benzylic C(sp3)-H oxidation (∼0.02 mol% Co and 76% conversion for nanosheets), ascribed to the exposed, accessible and coordinatively unsaturated CoII species.
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