Synthesis of Pyridazine Derivatives. IX. Formation of Pyridazines in the ·Reaction of Some Acid Anhydrides with Hydrazines

Abstract

Reaction between 4-cyclohexene-1 ;2-dicarboxylic acid anhydride and hydrazine hydrate was investigated. There were obtained d ifferent products depending on reaction conditions but no pyridazines were formed . The reaction betwee n hydrazino pyridazines and different acid anhydrides was also investigated and only monohydrazides were obtained. Finally, a ring contraction of a pyridazine derivative into a pyrazole derivative has been established