Process for the preparation of 6-chloro-2,4-dinitrophenol

US4540832A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Otto Arndt · Hofheim, DE
• Theodor Papenfuhs · Frankfurt, DE

Key dates

• Filing date: Apr 26, 1984
• Grant date: Sep 10, 1985
• Expiry date: Apr 26, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of 6-chloro-2,4-dinitrophenol in a high yield and in a high degree of purity by saponifying 2,4-dinitrochlorobenzene and/or 2,4-dinitrophenyl alkyl ethers of the formula ##STR1## in which m denotes the number 2, 3 or 4 and n denotes the number 1 or 2, by means of aqueous sodium hydroxide or potassium hydroxide solution and chlorinating the resulting 2,4-dinitrophenol with sodium hypochlorite, which comprises chlorinating the 2,4-dinitrophenol, without prior isolation as an intermediate, in aqueous suspension at a pH value of 3.5-7 by means of chlorine bleach liquor at temperatures of 5.degree. to 20.degree. C.