Patent · US Expired

Process for producing 2,3-difluoro-6-nitrophenol

US5292967A · kind A · utility

1Cited by

3References

9Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Theodor Papenfuhs · Frankfurt, DE
Joachim Hackenbruch · Ginsheim-Gustavsburg, DE
Ralf Pfirmann · Griesheim, DE

Key dates

Filing date	Mar 23, 1993
Grant date	Mar 8, 1994
Priority date	—
Expiry date	Mar 23, 2013

Classification

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

Abstract

According to a process for producing isomer-free 2,3-difluoro-6-nitrophenol, 2,3,4-trifluoronitrobenzene is reacted with an aqueous solution of alkali metal or alkaline earth metal hydroxide in the absence of organic solvent, at temperatures between about 20.degree. C. and 100.degree. C., the pH value of the reaction mixture is set at about 1 to 6 by acid addition, the resulting product is stream distilled and the 2,3-difluoro-6-nitrophenol is isolated after cooling. No organic solvents are used during any of the steps of the process.

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