Synthesis of Pyrazoline and Isoxazoline in Triethanolamine Medium.

Reactions of chalcones la-u with phenylhydrazine and hydrazine hydrate give pyrazolines 2a-u and with hydroxylamine hydrochloride yield isoxazolines 3a-c in triethanolamine medium. The structures of products are established by melting points, chemical studies and spectral data (IR and 1 HNMR).