Patent · US Expired

Process for the preparation of 2-nitro-3, 6-dichlorophenol

US5292966A · kind A · utility

0Cited by

4References

20Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Michael Meier · Frankfurt am Main, DE
Heinz-Georg Kautz · Nierstein, DE

Key dates

Filing date	Mar 16, 1993
Grant date	Mar 8, 1994
Priority date	—
Expiry date	Mar 16, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C201/08
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

2-Nitro-3,6-dichlorophenol is prepared by sulfonation of 2,5-dichlorophenol and subsequent nitration and desulfonation, in which the nitration is carried out by metering in a nitrating acid composed of 98 to 100% strength nitric acid and 96 to 100% strength sulfuric acid at temperatures from -15.degree. to 35.degree. C. and a metering time of at least 1 hour.

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