Abstract
The oxidation of thymol and carvacrol to thymoquinone with potassium peroxymonosulfate (KHSO5) catalyzed by iron phthalocyanine tetrasulfonate (FePcTS) in a methanol (4.0 mL)–water (0.5 mL) mixture has been carried out. In a typical reaction, the amounts of the substrate, oxidant, and catalyst were 0.300, 0.600, and 1 × 10−3 millimoles, respectively. Ninety-nine percent conversions of thymol in 1 h and of carvacrol in 30 min were achieved at ambient temperature. The major product of both oxidation reactions was thymoquinone (2-isopropyl-5-methylbenzoquinone, TQ) and the reactions also yielded polymeric products poly(2-isopropyl-5-methyl-1,4-phenylene oxide) and poly(5-isopropyl-2-methyl-1,3-phenylene oxide). These polymers are novel and not reported before. When H2O2 or ButOOH was used as the oxidant, the yield of TQ was <1 %.
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Acknowledgments
This research was supported by Anadolu University Scientific Research Commission, Turkey (Grant No. 1505F313). The authors would like to thank Dr. İlhami Çelik for taking the 1H NMR and gHSQCAD NMR spectra.
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Günay, T., Çimen, Y., Karabacak, R.B. et al. Oxidation of Thymol and Carvacrol to Thymoquinone with KHSO5 Catalyzed by Iron Phthalocyanine Tetrasulfonate in a Methanol–Water Mixture. Catal Lett 146, 2306–2312 (2016). https://doi.org/10.1007/s10562-016-1850-2
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DOI: https://doi.org/10.1007/s10562-016-1850-2