REINVESTIGATION OF THE REACTION OF 3-SUBSTITUTED 1,2,4-TRIAZINES WITH NITRONATE ANIONS: UNEXPECTED BEHAVIOR OF 3-(2-ETHOXYPHENYL)-1,2,4-TRIAZINE IN THE REACTION WITH ANIONS OF NITROALKANES

Авторы

  • Mariusz Mojzych Department of Chemistry, Siedlce University of Natural Sciences and Humanities, 3-go Maja 54, 08-110 Siedlce, Poland
  • Zofia Bernat Department of Chemistry, Siedlce University of Natural Sciences and Humanities, 54 3-go Maja St., 08-110 Siedlce, Poland
  • Zbigniew Karczmarzyk Department of Chemistry, Siedlce University of Natural Sciences and Humanities, 54 3-go Maja St., 08-110 Siedlce, Poland

DOI:

https://doi.org/10.1007/4983

Ключевые слова:

nitroalkanes, nitronate anions, oximes, 1, 2, 4-triazine, nucleophilic substitution reaction.

Аннотация

3-Substituted 1,2,4-triazines easily react with nitronate anions to replace hydrogen atom in the position C-5 according to nucleophilic substitution mechanism and form appropriate oximes of 5-formyl- or 5-acyl-1,2,4-triazines. Present study has shown that the course of the reaction strongly depends on the structure of the substituent in the position C-3 of 1,2,4-triazine ring. Thus, 2-ethoxyphenyl substituent in 1,2,4-triazine allowed to form, besides appropriate oximes, also new nitronic acid derivatives stabilized by intramolecular hydrogen bonds. The synthesis pathway and molecular structures of oximes were confirmed by X-ray analysis performed for model compound 1-[3-(2-ethoxyphenyl)-1,2,4-triazin-5-yl]ethanone oxime. The presence of the new nitronic acid derivatives in the reaction mixture and the theoretical calculations at DFT/B3LYP/6-311++G(d,p) level strongly suggest that intermediate stabilized by bifurcated intramolecular
hydrogen bond is a common intermediate for the construction of  appropriate oximes.

Биография автора

Mariusz Mojzych, Department of Chemistry, Siedlce University of Natural Sciences and Humanities, 3-go Maja 54, 08-110 Siedlce, Poland

Department of Chemistry, Siedlce University of Natural Sciences and Humanities,

Опубликован

2019-09-27

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Раздел

Оригинальные статьи