Reactions of 2,3-disubstituted 6,7-dihydro-5H-2a-thia(2a-SIV)-2,3,4a,7a-tetraazacyclopent[cd]indene-1,4(2H,3H)-dithiones with isothiocyanates and isocyanates

12π-Tetraazapentalenes, 2,3-disubstituted 6,7-dihydro-5H-2a-thia(2a-S^IV)-2,3,4a,7a-tetraazacyclopent-cd]indene-1,4(2H,3H)-dithiones, 1 and 7 , reacted with excess alkyl or aryl isothiocyanates and isocyanates to afford mono- and di-alkyl or aryl substituted tetraazapentalene derivatives which have the thiocarbonyl and carbonyl groups.