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Highly efficient Cu(ii)-pyrazoledicarboxylate heterogeneous catalysts for a base-free aerobic oxidation of benzylic alcohol to benzaldehyde with hydrogen peroxide as the oxidant

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Abstract

A new Cu(II) pyrazoledicarboxylate coordination polymer [Cu(Hpdc)(ImH)]n (1) (H3pdc = 3,4-pyrazoledicarboxylic acid; ImH = imidazole) has been hydrothermally synthesized and characterized by elemental analysis, FT-IR, X-ray diffraction, and thermogravimetric analysis. In 1, the tetradentate Hpdc2− anion coordinated to three Cu(II) ions in a μ3-κO: κN, O′: κN′ mode, forming a two-dimensional (2D) (4,4) network; the other ImH ligand acted as a terminal ligand. Cu(II)-MOF 1 displayed high activity and selectivity in the base-free aerobic oxidation of benzyl alcohol to benzaldehyde combined with the green oxidant H2O2. The catalytic system of 1 could be reused for several cycles without any obvious decay of the catalytic efficiency.

Graphical abstract: Highly efficient Cu(ii)-pyrazoledicarboxylate heterogeneous catalysts for a base-free aerobic oxidation of benzylic alcohol to benzaldehyde with hydrogen peroxide as the oxidant

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Supplementary files

Article information


Submitted
31 Dec 2019
Accepted
19 May 2020
First published
19 May 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

Highly efficient Cu(II)-pyrazoledicarboxylate heterogeneous catalysts for a base-free aerobic oxidation of benzylic alcohol to benzaldehyde with hydrogen peroxide as the oxidant

M. Cheng, M. Qin, L. Sun, L. Liu, Q. Liu and X. Tang, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04927D

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