Azulenesquaric acid dyes, azulene intermediates therefor, and optical recording medium

US5084592A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Schrott · Cologne, DE
• Peter Neumann · Wiesloch, DE
• Sibylle Brosius · Ludwigshafen, DE
• Helmut Barzynski · Bad Dürkheim, DE
• Klaus D. Schomann · Stockach, DE
• Harald Kuppelmaier · Heidelberg, DE

Key dates

• Filing date: Sep 30, 1988
• Grant date: Jan 28, 1992
• Expiry date: Sep 30, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B57/007
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Azulenesquaric acid dyes of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings are prepared from azulene derivatives of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have specified meanings as intermediates, and used in an optical recording medium.