Process for the production of quinizarine derivatives which are

Details Process for the production of quinizarine derivatives which are Process for the production of quinizarine derivatives which are

1985-08-14

1987-02-24

Hollrah, Glennon H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260369, 260384, C07C 5024, C07C 5034

Patent

active

046456260

ABSTRACT:
The invention relates to a process for the production of 1,4,5,8-tetrahydroxyanthraquinone or 5,8-dichloro-1,4-dihydroxyanthraquinone by reacting phthalic anhydride with p-chlorophenol in oleum and in the presence of a boron catalyst, to give the quinizarine boron complex, and chlorinating this boron complex direct with a chlorinating agent, in the same reaction medium, to give the boron complex of dichloroquinizarine, and subsequently hydrolyzing this chlorinated boron complex to 1,4,5,8-tetrahydroxyanthraquinone or 5,8-dichloro-1,4-dihydroxyanthraquinone.
The novel process is environmentally and economically more advantageous than the sum of each of the individual process steps.

REFERENCES:
patent: 3631074 (1971-12-01), Bien et al.
patent: 3821262 (1974-06-01), Schoenauber et al.

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