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2-Polyfluoroalkylchromones. 11. Synthesis and structures of 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-pyrazolines and 3(5)-(2-hydroxyaryl)-5(3)-polyfluoroalkylpyrazoles

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Abstract

The reaction of 2-hydroxy-2-polyfluoroalkylchroman-4-ones with hydrazine affords 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-pyrazolines, whereas 2-polyfluoroalkylchromones under similar conditions produce 3(5)-(2-hydroxyaryl)-5(3)-polyfluoroalkylpyrazoles. 5-(2-Hydroxyaryl)-1-methyl-3-polyfluoroalkylpyrazoles were synthesized in the reaction with methylhydrazine, and the reaction with phenylhydrazine afforded regioisomeric 3(5)-(2-hydroxyphenyl)-1-phenyl-5(3)-polyfluoroalkylpyrazoles.

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Authors and Affiliations

  1. A. M. Gorky Ural State University, 51 prosp. Lenina, 620083, Ekaterinburg, Russian Federation

    V. Ya. Sosnovskikh, M. A. Barabanov & A. Yu. Sizov

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  1. V. Ya. Sosnovskikh
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  2. M. A. Barabanov
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  3. A. Yu. Sizov
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Sosnovskikh, V.Y., Barabanov, M.A. & Sizov, A.Y. 2-Polyfluoroalkylchromones. 11. Synthesis and structures of 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-pyrazolines and 3(5)-(2-hydroxyaryl)-5(3)-polyfluoroalkylpyrazoles. Russian Chemical Bulletin 51, 1280–1291 (2002). https://doi.org/10.1023/A:1020960815497

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