Preparation of 1-alkyl-2-chloro-5-nitrobenzene-4-sulfonic acids

US4427600A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Tonne
• Elisabeth Mueller · Frankenthal (Pfalz), DE
• Helmut Goerth · Ludwigshafen, DE

Key dates

• Filing date: Jan 29, 1982
• Grant date: Jan 24, 1984
• Expiry date: Jan 29, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of compounds of the formula I ##STR1## where R is alkyl, by sulfonation, chlorination and nitration starting from an alkylbenzene, wherein the alkylbenzene is sulfonated with from 2.5 to 3, preferably from 2.65 to 2.75, moles of concentrated sulfuric acid per mole of alkylbenzene, the reaction product is then reacted with from about 1.1 to 1.3 moles of chlorine in the absence of a catalyst, the product is subsequently nitrated with highly concentrated nitric acid at elevated temperatures and the nitro compound is isolated.