Tetraindolyl-heptamethine derivatives

US5118814A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Horst Berneth · Leverkusen, DE
• Hubertus Psaar · Leverkusen, DE
• Gunter Klug · Langenfeld, DE

Key dates

• Filing date: Sep 28, 1989
• Grant date: Jun 2, 1992
• Expiry date: Sep 28, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D417/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Tetraindolyl-heptamethine derivatives of the isomeric formulae ##STR1## in which A, B, D and E denote ##STR2## and may be identical to or different from one another, and the other symbols have the meaning indicated in the description, are used in pressure-sensitive and heat-sensitive recording materials.