Patent · US Expired

Preparation of arylaminohydroxyanthraquinones

US6420576B1 · kind B1 · utility

0Cited by

1References

6Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Josef-Walter Stawitz · Cologne, DE
Stephan Michaelis · Leverkusen, DE

Key dates

Filing date	Jul 26, 2000
Grant date	Jul 16, 2002
Priority date	—
Expiry date	Jul 26, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B1/5145
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The process for preparing arylaminohydroxyanthraquinone of the formula by reacting appropriate chlorohydroxyanthraquinone with an amine of the formula (III)H2N—Ar  (III),is characterized in that one mole of amine of the formula (III) plus an excess of 10 to 100% based on one mole of amine is used per chlorine atom in the compounds of the formula (II) and the reaction is carried out in an inert solvent in the presence of a base selected from the group consisting of the carbonates of the alkali and alkaline earth metals, the acetates of the alkali metals, the phosphates of the alkali metals and any mixtures thereof.

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