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Selective One‐Step Aerobic Oxidation of Cyclohexane to ϵ‐Caprolactone Mediated by N ‐Hydroxyphthalimide (NHPI)
Author(s) -
Wang Lingyao,
Zhang Yuanbin,
Du Renfeng,
Yuan Haoran,
Wang Yongtao,
Yao Jia,
Li Haoran
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900282
Subject(s) - cyclohexane , aldehyde , chemistry , radical , selectivity , caprolactone , photochemistry , catalysis , organic chemistry , polymer chemistry , copolymer , polymer
The selective one‐step aerobic oxidation of cyclohexane to ϵ‐caprolactone was achieved in the presence of N ‐hydroxyphthalimide (NHPI) and aldehyde under mild conditions. Remarkably, 12 % of cyclohexane was converted with a selectivity of 77 % of ϵ‐caprolactone and 15 % of KA oil. Control experiments indicated that NHPI accelerated the oxidation of aldehydes and peroxy radicals generated from aldehydes in situ were the key intermediates in the period of CH bond activation. 2,2,6,6‐Tetramethylpiperidine 1‐oxyl (TEMPO) addition and a series of m ‐chloroperoxybenzoic acid ( m ‐CPBA) oxidation experiments showed that the oxidation proceeded via a complex radical chain mechanism.