Symmetric benzophenones substituted by groups containing fluorine

US4792635A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Albrecht Marhold · Leverkusen, DE
• Erich Klauke
• Ernst Kysela · Bensberg, DE

Key dates

• Filing date: Mar 19, 1985
• Grant date: Dec 20, 1988
• Expiry date: Mar 19, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D319/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Symmetric benzophenones substituted by groups containing fluorine are prepared by reacting aromatic compounds substituted by groups containing fluorine with formaldehyde and/or a formaldehyde derivative, with the addition of hydrogen fluoride, fluorosulphonic acid and/or sulphuric acid, to give the corresponding diphenylmethanes and oxidizing these. The symmetric benzophenones substituted by groups containing fluorine are used for the preparation of polyether ketones by reacting them with diols. New symmetric benzophenones substituted by groups containing fluorine are also disclosed.