1, 3-Dipolar Cycloaddition of Pyridazinium Ylides with Perhalocycloalkenes and Thermal Decomposition of the Adducts

Abstract

Some pyridazinium N-ylides underwent 1, 3-dipolar cycloaddition with perhalocyclopropenes and with a perhalocyclobutene. Thermal decomposition and chemical transformations of the pyrolyzed products afforded various hitherto unknown 2-chloropyrazolo[1, 5-b]pyridazine derivatives.