Нужна следующая статья:
Ring contraction of a 5-acetylpyrimidine into pyrazoles by the action of substituted hydrazines in acidic medium
Gabriel Menichi, Mohamed Boutar, Bruno Kokel, Kaname Takagi, Michel Hubert-Habart
Journal of Heterocyclic Chemistry
Volume 23, Issue 1, pages 275–279, January/February 1986
- DOI:
http://dx.doi.org/10.1002/jhet.5570230157