Synthesis and reactions of chloroazodienes. A new and general synthesis of pyridazines

Article abstract of DOI:10.1016/0040-4039(95)01128-5

The reaction of dichlorohydrazones with Hunig's base gives 4-chloroazodienes, which were found to combine with a variety of electron rich olefins to yield chloro-substituted tetrahydropyridazines. These chloroazodiene cyclizations are best characterized a