Process for the preparation of indigo compound

Indigo compounds are prepared by reacting indole compounds unsubstituted in the 2- and 3-positions, with organic hydroperoxides. The reaction may be carried out in aqueous or organic solution, preferably in the presence of a catalyst capable of oxidizing the indole 3-carbon atom, compounds of metals...

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Bibliographic Details
Main Authors HARA, ISAO, TAKAKI, USAJI, AOKI, SHINOBU, YAMAMOTO, YOSHIHIRO, SUZUKI, HIROHARU
Format Patent
LanguageEnglish
French
German
Published 30.08.1989
Subjects
ADHESIVES
CHEMISTRY
DYES
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Summary:Indigo compounds are prepared by reacting indole compounds unsubstituted in the 2- and 3-positions, with organic hydroperoxides. The reaction may be carried out in aqueous or organic solution, preferably in the presence of a catalyst capable of oxidizing the indole 3-carbon atom, compounds of metals of group 4A, 5A and 6A of the Periodic Table.
Bibliography:Application Number: EP19890301658