SYNTHESIS AND REACTIONS OF SOME ETHYL 3-AROYL-4-ARYL-2-PYRAZOLINE-5-CARBOXYLATES

A series of ethyl 3-aroyl-4-aryl-2-pyrazoline-5-carboxylates 1 was pre pared. Their reactions with bromine water, potassium permanganate and potassium hydroxide afforded the corresponding pyrazoles. With aryl an d aroyl hydrazines the pyrazolines 1 gave the Schiff bases 9 while wit h hydrazine hydrate they yielded the corresponding acid hydrazides 11. Condensation of 11 with aromatic aldehydes gave the arylidene derivat ives 12, which on cyclization with the proper reagent afforded 13 or 1 4. Reaction of 1 with hydrochloric acid gave the corresponding dipyraz olo-pyrazine derivatives 10.