Patent · US Active

Process for preparing 4,4′ difluorobenzophenone

US7687668B2 · kind B2 · utility

2Cited by

1References

5Claims

0Family size

Assignee

EVONIK FIBRES GMBH · AT

Inventors

Harald Rögl · Wels, AT
Markus Ungerank · Ansfelden, AT

Key dates

Filing date	Jul 27, 2006
Grant date	Mar 30, 2010
Priority date	—
Expiry date	Jul 27, 2026

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C49/813
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for preparing 4,4′-difluorobenzophenone, characterized in that, in a first step, fluorobenzene is reacted with formaldehyde under catalysis by organic sulphonic acids to give difluorodiphenylmethane, the product obtained is isolated, and, in a second step, oxidized with nitric acid to give 4,4′-difluorobenzophenone. 4,4′-Difluorobenzophenone (4,4′-DFBP) is the central starting material for the preparation of aromatic polyether ketones.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.