Process for making 2,5-dihalogenated phenol

US9988333B2 · kind B2 · utility

Inventors

• Andreas Pletsch · Schifferstadt, DE
• Nicole Holub · Mannheim, DE
• Thomas Ulrich · Olten, CH
• Petr Kvita · Reinach, CH
• Laurent Cavin · Frenkendorf, CH

Key dates

• Filing date: May 18, 2015
• Grant date: Jun 5, 2018
• Expiry date: May 18, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C241/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for reacting chemical compounds comprising the step of reacting a compound of formula (IV) wherein Hal is independently selected from Cl or Br, and X− is a monovalent anion, in the presence of an inorganic acid, wherein the aqueous inorganic acid has a concentration of at least about 60%, at a temperature of about 140° C. to about 250° C., to obtain a compound of formula (V) wherein Hal is as defined above.