Conclusions
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1.
A scheme of the mechanism of the so-called anamolous Fischer-Arbuzov reaction was proposed on the basis of a study of the products of catalytic decomposition of acetonephenylhydrazone in the presence of Cu2Cl2.
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2.
The decomposition of acetaldehydephenylhydrazone proceeds according to an analogous scheme and leads to the formation of 1-phenyl-5-methylpyrazoline.
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3.
A pyrazole is also formed in the case of acetophenonephenylhydrazone.
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4.
Aromatization of pyrazoline to pyrazole was accomplished, with elimination of hydrocarbon under the conditions of the reaction studied.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2397–2402, November, 1971.
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Kitaev, Y.P., Troepol'skaya, T.V. Synthesis of heterocyclic compounds based on the reaction of E. Fischer Communication 3. New data on the mechanism of the “anamolous” Fischer-Arbuzov reaction. Russ Chem Bull 20, 2277–2282 (1971). https://doi.org/10.1007/BF00854295
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DOI: https://doi.org/10.1007/BF00854295