Process for the preparation of 1,2-fused five-membered or six-membered 1,3-dinitrogen-heterocyclic compounds and their use

Abstract From the Canadian patent

1,2-fused five-membered or six-membered 1,3dinitrogen-heterocyclic compounds, useful as anti-corrosion agents, having the formula, (I), wherein A is an optionally substituted, optionally polynuclear orth- or peri-arylene, radical and B is an optionally substituted alkylene chain wherein, R1 and R2 individually represent hydrogen and/or optionally substituted aliphatic, cycloaliphatic araliphatic or aromatic, radicals and, n represents a number from 3 to 6 or, B is an optionally substituted 1,8-naphthylene 2,2'-diphenylene or 4,5-phenanthrylene radical, are prepared by splitting a five-membered or six-membered 1,3- dinitrogen-heterocyclic compound, which contains a 2-(.omega.-amino group) …