Studies on thieno[3,4-d]pyridazine and electron acceptor compounds

Ethyl 5-amino-3,4-dihydro-1-oxo-3-aryl-thieno[3,4-d]pyridazine-1-carboxylate 1a,b gave N,N-1-di(ethyl-3,4-dihydro-4-oxo-3-aryl-thieno[3,4-d]pyridazine-1-carboxylate)hydrazine and N,N-1-di(ethyl-3,4-dihydro-4-oxo-3-aryl-thieno[3,4-d]pyridazine-1-carboxylate)aminocyanomethaneimine as well as di(ethyl-3,4-dihydro-4-oxo-3-aryl-thieno[3,4-d]pyridazine-1-carboxylate)amine when reacted with tetracyanoethylene (TCNE), 2-(dicyanomethyleneindane-1,3-dione) (CNIND) and 1,4-benzo- as well as 1,4-naphthoquinone.