E. Tretyakov, A. M. Maksimov, P. V. Nikul’shin
May 1, 2021
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Journal
Russian Chemical Bulletin
Abstract
A new method for the preparation of 2,3,4,5-tetrafluorophenol from 2-[(2,3,4,5,6-pentafluorophenyl)thio]acetic acid has been proposed. It included the intramolecular cyclization of the salt of this acid in the presence of K 2 CO 3 with the substitution of the ortho fluorine atom and the formation of a lactone, which under the reaction conditions underwent the ring-opening with the formation of the potassium salt of 2-[6-hydroxy(2,3,4,5-tetrafluorophenyl)-thio]acetic acid. The resulting salt was converted into methyl ester and desulfurized with Raney nickel to 2,3,4,5-tetrafluorophenol. The proposed method is a simple and efficient way to obtain poorly available 2,3,4,5-tetrafluorophenol in ∼58% total yield based on 2-[(2,3,4,5,6-pentafluorophenyl)thio]acetic acid.