A reaction of pyridazine 1-oxide with Grignard reagents prepared from bromobenzene, p-bromotoluene, o-bromotoluene, m-bromotoluene, p-bromoanisol and o-bromoanisol, gave the corresponding 1-aryl-trans-1-butene-3-yne (III) in about 30% yields. These structures were determined by in frared and nuclear magnetic resonance spectroscopy.
