FREMGANGSMAATE FOR FREMSTILLING AV 3,3`-AZO-BIS-(6-HYDROKSYBENZOSYRE)

A method of preparing 3,3'-azo-bis-(6-hydroxy benzoic acid) of formula I I and salts thereof in at least 98% purity for treating inflammatory intestinal diseases. According to the invention a compound II II is diazotized, and the diazonium salt obtained is coupled with a compound III III The fo...

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Bibliographische Detailangaben
Hauptverfasser:	AGBACK, KARL HUBERT, NYGREN, ALF SIGURD
Format:	Patent
Sprache:	nor
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS ADHESIVES CHEMISTRY DYES HUMAN NECESSITIES HYGIENE LAKES MEDICAL OR VETERINARY SCIENCE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC CHEMISTRY ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS POLISHES PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS ORMEDICINAL PREPARATIONS
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Beschreibung
Zusammenfassung:	A method of preparing 3,3'-azo-bis-(6-hydroxy benzoic acid) of formula I I and salts thereof in at least 98% purity for treating inflammatory intestinal diseases. According to the invention a compound II II is diazotized, and the diazonium salt obtained is coupled with a compound III III The formed intermediate IV, which is also comprised by the invention, IV is hydrolized in alkaline medium to form the compound I. R1, R2 and R3 signify lower alkyl, R2 also possibly substituted phenyl.