Utilization of DmbNHNH2 in the synthesis of amino-substituted 4-((3,5-diamino-1H-pyrazol-4-yl)diazenyl)phenols
✍ Scribed by Eva Schütznerová; Igor Popa; Vladimír Kryštof; Hiroyuki Koshino; Zdeněk Trávníček; Pavel Hradil; Petr Cankař
- Book ID
- 113929402
- Publisher
- Elsevier Science
- Year
- 2012
- Tongue
- French
- Weight
- 504 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0040-4020
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## Abstract A series of pyrazolines **4a–h** has been synthesized by Michael addition of chalcones **3a–h** with hydrazine hydrate in the presence of sodium acetate under conventional heating or microwave irradiation. Structures of the newly synthesized pyrazolines **4a–h** have been established on
The Schiff bases 3a-h obtained from 4-amino-1,2,4-triazol-3-ones 1a-h when subjected to Japp-Klingemann reaction yielded the corresponding 3-{2-[(2-aryl-5-methyl-3H-[1,2,4]-triazol-3-one-4-yl)]-iminophenyl}-pentane-2,4-diones 4 a-h. These diones on cyclisation with N 2 H 4 yielded the title compound