Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2006-01-01

Journal: DYES AND PIGMENTS

Included Journals: EI、SCIE

Volume: 71

Issue: 3

Page Number: 231-235

ISSN: 0143-7208

Key Words: bromoamine acid; de-sulfonation; 1-aminoantraquinone-2,4-disulfonic acid

Abstract: I-Amino-4-bromoanthraquinotie-2-sulfoiiic acid (bromoamine acid) is an important intermediate for dyes. 1-Aminoanthraquinone2,4-disulfonic acid is the major impurity when 1-aminoanthraquinone is sulfonated in oleum to synthesize bromoamine acid. The mechanism of bromination of 1-aminoanthraquinone-2,4-disulfonic acid in sulfuric acid has been studied. It is proved that I-aminoanthraquinone-2,4-disulfonic acid undergoes de-sulfonation first to form 1-aminoanthraquinoine-2-sulfonic acid, and then bromination to form bromoamine acid. Based on this mechanism, a new optimal process for the synthesis of bromoamine acid is developed. In this way, bromoamine acid is afforded in high yield and good quality. (c) 2005 Elsevier Ltd. All rights reserved.