Patent · US Expired

Process for the preparation of 1-amino-4-bromoanthraquinone-2-sulphonic acid I

US4213910A · kind A · utility

1Cited by

2References

11Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Rolf Muders · Cologne, DE
Heinrich Leister
Helmut Dittmer · Leverkusen, DE
Hubert Schonhagen · Odenthal, DE

Key dates

Filing date	Sep 5, 1978
Grant date	Jul 22, 1980
Priority date	—
Expiry date	Sep 5, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C303/06
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing 1-amino-4-bromoanthraquinone-2-sulphonic acid or an alkali metal salt thereof which comprises contacting 1-amino-anthraquinone at a temperature in the range of 90.degree. to 150.degree. C. with an SO.sub.3 -containing sulphuric acid (oleum) and thereafter treating the resultant sulphonated 1-amino-anthraquinone with at least 0.5 molar equivalent of bromine, relative to 1 mol of 1-amino-anthraquinone, at temperatures in the range from 60.degree. to 100.degree. C.

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