Chromogenic 4,4-diaryldihydroquinazolones

US4754034A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Horst Berneth · Leverkusen, DE
• Alfred Brack · Odenthal, DE
• Karlheinrich Meisel · Odenthal, DE

Key dates

• Filing date: Oct 21, 1985
• Grant date: Jun 28, 1988
• Expiry date: Oct 21, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B11/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

4,4-diaryldihydroquinazolones of the formula ##STR1## wherein X.sup.1, X.sup.2 and X.sup.3, independently of one another, denote hydrogen, halogen, alkyl, aryl, alkanoylamino, aroylamino, heteryl, NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3, at least one of the radicals X.sup.1, X.sup.2 or X.sup.3 standing for NY.sup.1 Y.sup.2, OY.sup.3 or SY.sup.3, PA1 R.sup.1 denotes hydrogen, alkyl, cycloalkyl, aralkyl, aryl or the members of a bridge to the o-carbon of ring C, PA1 R.sup.2 denotes a radical of an acid, PA1 Y.sup.1, Y.sup.2 and Y.sup.3, independently of one another, denote hydrogen, alkyl, cycloalkyl, aralkyl aryl or heteryl or the remaining members of a 5- or 6-membered ring which reaches to one of the o-position benzene C atoms and may contain further hetero atoms or PA1 Y.sup.1 +Y.sup.2 denote the remaining members of a 5- or 6-membered ring which may contain further hetero atoms and the rings A, B and C and the radicals mentioned can in turn carry nonionic substituents customary in dye-stuff chemistry, find utility in pressure-copyable thermoreactive and electrochromic recording materials.