Carbonyloxy-substituted azulenesquaric acid dyes, intermediates therefor and optical recording medium

US5728867A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Oct 25, 1990
• Grant date: Mar 17, 1998
• Expiry date: Oct 25, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/007
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Carbonyloxy-substituted azulenesquaric acid dyes of the formula ##STR1## where L is C.sub.1 -C.sub.12 -alkylene which may be substituted by phenyl, PA1 R.sup.1 is C.sub.1 -C.sub.12 -alkyl, monounsaturated or polyunsaturated C.sub.3 -C.sub.12 -alkenyl, which may be phenyl-substituted, C.sub.3 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.7 -cycloalkenyl, substituted or unsubstituted phenyl, pyrrolyl, furanyl, thienyl or pyridyl and PA1 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.3 is hydrogen the positions of the substituents CH.sub.2 --L--O--CO--R.sup.1 and R.sup.4 on either or both azulene rings may also be interchanged with each other within an azulene ring, are useful in an optical recording medium.