Process for the production of halogeno-o-hydroxydiphenyl compounds

US6239317A · kind A · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Surendra Kulkarni · Mumbai, IN
• Vadiraj Ekkundi · Mumbai, IN
• Pradeep Nadkarni · Bengaluru, IN
• Chandrasekhar Dayal Mudaliar · Mumbai, IN
• Kishore Ramachandra Nivalkar · Mumbai, IN

Key dates

• Filing date: Feb 5, 1998
• Grant date: May 29, 2001
• Expiry date: Feb 5, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

There is described a four step process for the production of halogeno-o-hydroxydiphenyl compounds having the formula ##STR1## in which X is --O--or --CH.sub.2 --; PA1 m is 1 to 3; and PA1 n is 1 or 2; wherein in the first step, a diphenyl compound is chlorinated; in a second step the chlorinated compound is acylated in a Friedel-Crafts reaction and optionally again chlorinated after the acylation; in a third step the acyl compound is oxidised; and in a fourth step the oxidized compound is hydrolyzed. The compounds of formula (1) are useful for the protection of organic materials against microorganisms.