Title:
PRODUCTION OF ANTHRAQUINONE INTERMEDIATE AND VAT DYE
Document Type and Number:
Japanese Patent JPS62280261
Kind Code:
A
Abstract:
A novel process for the preparation of anthraquinoid intermediates and vat dyes by alkali fusion of suitable precursors in the presence of alcohol. The process comprises starting from benzanthrone, pyrazolanthrone or anthraquinone derivatives and carrying out the reaction in a machine with kneading action and in the presence of an alkali metal hydroxide and an aliphatic alcohol with a boiling point below 120 DEG C., at elevated temperature, to effect dimerization or cyclization, the weight ratio of alkali metal hydroxide to benzanthrone, pyrazolanthrone or anthraquinone derivative being <1:1. The process makes it possible to prepare in good quality anthraquinoid intermediate which can be further processed to dyes, as well as vat dyes which are suitable for dyeing or printing cellulosic material.
Inventors:
RUDORUFU BURATSUTONAA
Application Number:
JP11873487A
Publication Date:
December 05, 1987
Filing Date:
May 15, 1987
Export Citation:
Assignee:
CIBA GEIGY AG
International Classes:
C09B3/26; C09B3/24; C09B5/04; (IPC1-7): C09B3/22
Domestic Patent References:
| JPS5398941A | 1978-08-29 |
Foreign References:
| US2456589A | 1948-12-14 | |||
| US3008962A | 1961-11-14 | |||
| US3004029A | 1961-10-10 |
Attorney, Agent or Firm:
Masao Okabe
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