Tri-phenyl methyl color-forming agents

US4897223A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Udo Eckstein · Cologne, DE
• Hubertus Psaar · Leverkusen, DE
• Roderich Raue · Dover, US

Key dates

• Filing date: Mar 1, 1988
• Grant date: Jan 30, 1990
• Expiry date: Mar 1, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D241/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Color-forming agents of the general formula ##STR1## wherein X denotes hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkoxycarbonyloxy, alkylamino, dialkylamino, acylamino, aralkylamino or arylamino, PA0 Q denotes cyano, alkoxycarbonyl, aryloxycarbonyl, aralkoxycarbonyl, carbamoyl, N-alkylcarbamoyl, N,N-dialkylcarbamoyl, N-alkyl-N-aryl-carbamoyl, acyl, alkoxysulphonyl, aralkoxysulphonyl, sulphamoyl, N-alkylsulphamoyl, N,N-dialkylsulphamoyl, alkylsulphonyl, arylsulphonyl or aralkylsulphonyl and PA0 R denotes alkyl, alkenyl or aralkyl, further isocyclic or heterocyclic rings can be fused on to the rings A, B, C and D, and the cyclic and acyclic radicals and the rings A, B, C and D can carry further substituents, are used for the preparation of pressure-sensitive recording materials.