Process for the preparation of 1,4-bis(4-hydroxybenzoyl)benzene

US5264633A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Joachim Hackenbruch · Ginsheim-Gustavsburg, DE
• Theodor Papenfuhs · Frankfurt, DE
• Arnold Schneller · Mainz, DE

Key dates

• Filing date: Apr 29, 1992
• Grant date: Nov 23, 1993
• Expiry date: Apr 29, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C45/54
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of 1,4-bis(4-hydroxybenzoyl)benzene of the formula (I) ##STR1## by rearranging diphenyl terephthalate of the formula (II) ##STR2## in about 3 to about 50 parts, relative to the diphenyl terephthalate, of an anhydrous organic solvent which is inert to the reactants, in the presence of about 30 to about 500 mol-% of a haloalkanesulfonic acid (catalyst) of the general formula (III) or (IV) EQU Y(C.sub.n X.sub.2n)SO.sub.3 H (III) EQU Y(C.sub.n F.sub.2n)SO.sub.3 H (IV) in which Y is a fluorine or hydrogen atom, and X is a fluorine and/or chlorine atom, with the proviso that at least one X is a fluorine atom, and n is an integer from 1 to 10, at temperatures of about 10.degree. to about 200.degree. C.