Abstract
2,9-Dihydrazinobipyrimidino(2,3- b )thienothiophene ( 2 ) was reacted with nitrous acid, ethoxymethylenemalononitrile, bromomalononitrile, triethyl formate, CS 2 or isatine to afford the corresponding tetrazole, triazepine, triazine, and triazole derivatives 3-8 respectively. Treatment of compound 2 with cyclohexylidenenitriles, acetylacetone, ethyl acetoacetate, 2-hydroxyacetophenone, or S,S-acetals afforded the corresponding pyrazole derivatives 9-15 respectively.