Naphthol derivatives, processes for their production and their use

US5194389A · kind A · utility

Assignee

• Boehringer Mannheim GmbH · DE

Inventors

• Walter Rittersdorf · Mannheim, DE
• Werner Guethlein · Mannheim, DE
• Peter Vogel · Diepersdorf, DE
• Detlef Thym · Mannheim, DE

Key dates

• Filing date: May 10, 1991
• Grant date: Mar 16, 1993
• Expiry date: May 10, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B29/103
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The subject matter of the present invention are naphthol derivatives having the general formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3 are the same or different and each represents hydrogen, an alkyl or alkoxy group, in which at least one of the residues is a (C.sub.8 -C.sub.30)-alkyl or alkoxy residue PA0 R.sup.4 is hydrogen or an alkyl group PA0 R.sup.5 is a nitro group, an alkyl group substituted by halogen, a cyano group, a sulfonamide group or an alkylsulfonyl group PA0 X is nitrogen or the residue CR.sup.6 and PA0 Y is sulphur or the residue CR.sup.7 =CR.sup.8 in which R.sup.6, R.sup.7, R.sup.8 are the same or different and each denotes hydrogen, halogen, a nitro group, a cyano group, an alkyl or an alkyl group substituted by halogen or an alkylsulfonyl group, a process for their production and their use as a pH indicator or in methods and agents for the determination of an ion in an aqueous liquid.