Chemistry of Heterocyclic Compounds

, Volume 17, Issue 9, pp 932–936 | Cite as

Electrophilic substitution in n-aryl-2-pyrazolines: Reactions with 1,3-dithioles

  • I. M. Gella
  • V. N. Vakula
  • V. D. Orlov


Dyes that absorb at 525–580 nm were obtained by the reaction of derivatives of 1,3-dithiolium iodide (or perchlorate) with 1-phenyl-3,5-di-R-2-pyrazolines, N,N-dimethylaniline, and benzaldehyde N-methylphenylhydrazone. It was demonstrated by alternative synthesis that the reaction takes place in the para position of the N-phenyl group. Dyes can be obtained in two steps from 2-dimethylamino-1,3-dithioles and activated aromatic compounds with subsequent oxidation of the intermediate leuco compounds with air oxygen.


Oxidation Oxygen Organic Chemistry Iodide Perchlorate 
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Copyright information

© Plenum Publishing Corporation 1982

Authors and Affiliations

  • I. M. Gella
    • 1
  • V. N. Vakula
    • 1
  • V. D. Orlov
    • 1
  1. 1.Kharkov Scientific-Research Institute of Endocrinology and the Chemistry of HormonesA. M. Gor'kii Kharkov State UniversityKharkov

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