Synthesis and magnetic studies of 2-(pyrazolyl)imidazoline-derived iminonitroxides and nitronylnitroxides

Sergey F. Vasilevsky, Eugene V. Tretyakov, Vladimir N. Ikorskii, Galina V. Romanenko, Sergey V. Fokin, Yurii G. Shwedenkov, Viktor I. Ovcharenko

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The reaction of formylpyrazoles 1c,g with 2,3-dimethyl-2,3-di(hydroxyamino) butane sulfate and followed by oxidation of the resulting 4,4,5,5-tetramethyl-2- (1H-pyrazolyl)imidazolidine-1,3-diols 2c,g with sodium periodate afforded 4,4,5,5-tetramethyl-2-(1H-pyrazolyl)-4,5-dihydro-1H-imidazol-3-oxide-1-oxyls 3c,g.. Reduction of 3a-h with sodium nitrite in the presence of acetic acid led to 4,4,5,5-tetramethyl-2-(1H-pyrazolyl)-4,5-dihydro-1H-imidazol-1-oxyls 4a-h. For 3b, 3c, and 4f, an anomalously large exchange coupling between the unpaired electrons of paramagnetic centers has been found.

Original languageEnglish
Pages (from-to)55-66
Number of pages12
Issue number9
Publication statusPublished - 1 Dec 2001
Externally publishedYes


  • Magnetic properties
  • Organic radicals
  • Pyrazolyliminonitroxides
  • Pyrazolylnitronylnitroxides

ASJC Scopus subject areas

  • Organic Chemistry

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