Azulenesquaric acid dyes that contain urethane groups

US4990649A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Schrott · Cologne, DE
• Peter Neumann · Wiesloch, DE
• Michael Schmitt · Worms, DE
• Sibylle Brosius · Ludwigshafen, DE
• Klaus D. Schomann · Stockach, DE
• Harald Kuppelhamier · Heidelberg, DE

Key dates

• Filing date: May 2, 1989
• Grant date: Feb 5, 1991
• Expiry date: May 2, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2602/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Azulenesquaric acid dyes of the formula ##STR1## where L is substituted or unsubstituted C.sub.1 -C.sub.12 -alkylene, PA0 R.sup.1 is C.sub.1 -C.sub.20 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl or substituted or unsubstituted phenyl and PA0 R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently of the others hydrogen or substituted or unsubstituted C.sub.1 -C.sub.12 -alkyl, with the proviso that when R.sup.5 is hydrogen the positions of the substituents CH.sub.2 --L--O--CO--NHR.sup.1 and R.sup.4 on an azulene ring may also be interchanged within a ring in either or both of the azulene rings, derived from azulene intermediates that contain urethane groups, are suitable for use in an optical recording medium.