Patent · US Expired

Process for the preparation of chlorofluronitrobenzenes and difluoronitrobenzenes

US5545768A · kind A · utility

1Cited by

14References

13Claims

0Family size

Assignee

Hoechet AG · DE

Inventors

Theodor Papenfhus · Frankfurt am Main, DE
Andreas Kanschik-Conradsen · Garbsen, DE
Wilfried Pressler · Kelkheim, DE

Key dates

Filing date	Dec 22, 1992
Grant date	Aug 13, 1996
Priority date	—
Expiry date	Dec 22, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C201/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of chlorofluoronitrobenzenes and difluoronitrobenzenes, which comprises heating dichloronitrobenzene to not more than 200.degree. C. in excess with an alkali metal fluoride having a total water content of about 0.2 to about 2.5% by weight in the presence of a quaternary ammonium and/or phosphonium salt, crown ether and/or polyethylene glycol dimethyl ether as catalyst in the absence of a solvent.

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