Process for the preparation of 1-acylamino-5(8)-chloroanthraquin

Details Process for the preparation of 1-acylamino-5(8)-chloroanthraquin Process for the preparation of 1-acylamino-5(8)-chloroanthraquin

1977-05-05

1979-12-18

Curtis, Allen B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260381, C07C 9724, C07C10375

Patent

active

041794508

ABSTRACT:
The invention relates to a novel process for the preparation of 1-acylamino-5(8)-chloroanthraquinones, which are starting materials for the preparation of vat dyes. It is characterized in that 1,5(8)-dichloroanthraquinones is reacted with ammonia at temperatures of 190.degree. to 240.degree. C., the amino groups in the reaction mixture are completely acylated and the more sparingly soluble diacylaminoanthraquinone is separated off from the more readily soluble monoacylaminochloroanthraquinone.
The new process yields reaction products which are purer and cheaper than those which are obtained by conventional methods. Moreover there are smaller waste water problems.

REFERENCES:
patent: 1923618 (1933-08-01), Groggins
patent: 2224112 (1940-12-01), Krzikalla et al.
patent: 2614108 (1952-10-01), Jenny et al.
patent: 2720533 (1955-10-01), Jenny et al.

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