Method for protecting metal from erosion

US4104194A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Artur Botta · Krefeld, DE
• Christian Rasp · Cologne, DE

Key dates

• Filing date: May 16, 1977
• Grant date: Aug 1, 1978
• Expiry date: May 16, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D487/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,2-Fused five-membered or six-membered 1,3-dinitrogen-heterocyclic compounds, useful as anti-corrosion agents, having the formula ##STR1## wherein A is an optionally substituted, optionally polynuclear orth- or peri-arylene radical and PA1 B is an optionally substituted alkylene chain ##STR2## WHEREIN R.sup.1 and R.sup.2 individually represent hydrogen and/or optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radicals and PA1 n represents a number from 3 to 6, Or PA1 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) side chain, having the formula ##STR3## wherein A and B have the meanings indicated above and PA1 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.