Process for the preparation of aromatic azo-compounds

Details Process for the preparation of aromatic azo-compounds Process for the preparation of aromatic azo-compounds

2006-08-15

2006-08-15

Powers, Fiona T. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

C534S660000, C534SDIG005

Reexamination Certificate

active

07091327

ABSTRACT:
The present invention relates to a process for the preparation of aromatic azo-compounds, in particular 3,3′-azo-bis(6-hydroxybenzoic acid) (olsalazine) and its salts and derivatives.

REFERENCES:
patent: 1157169 (1915-10-01), Mettler
patent: 4528367 (1985-07-01), Agback et al.
patent: 4559330 (1985-12-01), Agback et al.
patent: 276 863 (1990-03-01), None
patent: 0 036 636 (1981-03-01), None
patent: 0221515.0 (1924-10-01), None
Chen, Chemical Abstracts, 131:219150, 1999.
Yan et al., Chemical Abstracts, 129:302425, 1998.

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