Heterocyclic System : I. Reaction of 4-Oxo-4H-[I]-benzo- pyran-3-carboxaidehydes with Phenylhydrazine and Formation of 1-Phenyl-4-(2-hydroxybenzoyl)pyrazoles release_rmkt4l2wtrgafonsqxprcoeixu

Abstract

<strong>Organic Chemistry Laboratory, Department of Biochemistry, Calcutta University, Calcutta 700019 </strong> <strong>Manuscript </strong><strong><em>received 27 October 1976, revised 20 </em></strong><strong>April </strong><strong><em>1977. accepted 6 August 1977</em></strong> <strong>Phenylhydrazine undergoes 1 : 2 addition to the aldehydic function of 4-oxo-4H-[1] ­</strong><strong>benzopyran-3-carboxaldehydes (I), the addition products on elimination of water giving </strong><strong>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.</strong>
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