Process for preparing 1,2-fused-1,3-dinitrogen-heterocyclic compounds

Process for preparing a 1,2-fused five-membered or six-membered 1,3-dinitrogen-heterocyclic compound having the formula ##STR32## wherein A is an arylene radical and

• B is unsubstituted or halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted alkylene chain ##STR33## wherein R.sup.1 and R.sup.2 individually represent hydrogen and/or unsubstituted or halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted aliphatic, cycloaliphatic, araliphatic or aromatic radicals and
• n represents a number from 3 to 6, or
• B is unsubstituted or a halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted 1,8-naphthylene, 2,2'-diphenylene or 4,5-phenanthrylene radical,
• which comprises subjecting a five-membered or six-membered 1,3-dinitrogen-heterocyclic compound, which contains a 2-(.omega.-amino group) side chain, having the formula ##STR34## wherein A and B have the meanings indicated above and
• R.sup.3 and R.sup.4 are hydrogen, lower alkyl, cycloalkyl or aralkyl but at least one of the two radicals R.sup.3 and R.sup.4 must represent hydrogen to a temperature of 150.degree. to 400.degree. C.