Heterocyclic System I. Reaction of 4-Oxo-4H-[I]-benzo- pyran-3-carboxaidehydes with Phenylhydrazine and Formation of 1-Phenyl-4-(2-hydroxybenzoyl)pyrazoles
| Main Authors: | C. K. GHOSH, K. K. MUKHOPADHYAY |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1978
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6375036 |
Daftar Isi:
- Organic Chemistry Laboratory, Department of Biochemistry, Calcutta University, Calcutta 700019 Manuscript received 27 October 1976, revised 20 April 1977. accepted 6 August 1977 Phenylhydrazine undergoes 1 : 2 addition to the aldehydic function of 4-oxo-4H-[1] benzopyran-3-carboxaldehydes (I), the addition products on elimination of water giving the hydrazones (II). The latter on being refluxed in ethanolic potassium hydroxide yield 1-phenyl-4-(2-hydroxybenzoyl) pyrazoles (III)). The mechanism of this transformation and the mass spectral fragmentation of the pyrazoles (III) have been discussed.