Process for the preparation of anthraquinoid intermediates and v

Details Process for the preparation of anthraquinoid intermediates and v Process for the preparation of anthraquinoid intermediates and v

1987-05-07

1988-11-15

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260353, 260358, 260360, 260369, 260377, C07C 5022, C07C 5018, C07C10375, C09B 322

Patent

active

047848057

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.degree. 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.

REFERENCES:
patent: 1713680 (1929-05-01), Stein et al.
patent: 3004029 (1961-10-01), Hardy et al.
patent: 3418321 (1968-12-01), Gordon et al.

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