期刊
TETRAHEDRON
卷 69, 期 21, 页码 4241-4246出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.03.088
关键词
Mechanism; Baeyer-Villiger oxidation; Aldehyde; Metalloporphyrins; Cyclohexanone
资金
- Natural Science Foundation of China [21036009, 21176267]
- Guangdong Natural Science Foundation [S2011040001776]
We ever reported that benzaldehyde was more effective than isobutyraldehyde toward the Baeyer-Villiger oxidation of cyclohexanone by using meso-tetraphenylporphyrin chloride (FeTPPCl) as catalyst in the presence of molecular oxygen (96% yield of e-caprolactone in the presence of benzaldehyde vs 11% in the presence of isobutyraldehyde. J. Porphyrins Phthalocyanines 2008, 12, 94-100.). In this paper, the root causes for the remarkable differences in performance have been illuminated from the investigation of kinetic and mechanism. Based on the results of in situ FTIR, UV-vis spectra, and starch/KI experiments, the differences could be attributed to the varied mechanism for the two reaction systems. In the isobutyraldehyde-mediated aerobic Baeyer-Villiger oxidation of cyclohexanone system, peroxy isobutyric acid was the oxidative species to produce e-caprolactone. However, the process was via the generation of high-valent iron porphyrin, which was the active species in the benzaldehyde-mediated Baeyer-Villiger oxidation of cyclohexanone. (C) 2013 Elsevier Ltd. All rights reserved.
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