Tang Z, Xiao J, Li F, Ma Z, Wang L, Niu F, Sun X. Cobalt-Tetraamide-Phthalocyanine Immobilized on Fe
3O
4/Chitosan Microspheres as an Efficient Catalyst for Baeyer-Villiger Oxidation.
ACS OMEGA 2020;
5:10451-10458. [PMID:
32426602 PMCID:
PMC7226871 DOI:
10.1021/acsomega.0c00443]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 03/26/2020] [Indexed: 05/24/2023]
Abstract
Cobalt-Tetraamide-Phthalocyanine (CoTaPc) immobilized onto magnetic Fe3O4 chitosan microspheres (Fe3O4/CTO) was synthesized via a simple immersion method, which is an efficient catalyst for the oxidation of cyclic ketones to lactones with O2/benzaldehyde as the oxidant. The CoTaPc-Fe3O4/CTO catalyst was applied for the first time in the Baeyer-Villiger (B-V) oxidation reaction. Characterization results obtained from X-ray diffraction, UV-vis, Fourier transform infrared, and scanning electron microscopy showed that the combination of CoTaPc and magnetic Fe3O4/CTO microspheres was achieved. The catalyst could be easily separated from the reaction system with an external magnet and reused several times without the remarkable loss of activity. In addition, a possible radical mechanism for the B-V oxidation in this catalytic system is proposed and verified by controlled experiments.
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