Process for the production of quinizarine derivatives which...

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

C - Chemistry, Metallurgy

09

B

260/236.24

C09B 1/04 (2006.01) C07C 46/00 (2006.01)

Patent

CA 1167034

Case 1-12818/19 + Process for the production of quinizarine derivatives which are disubstituted in the 5- and 8-positions by hydroxyl or chlorine 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-chlorophenal, 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 hydrolysing this chlorinated boron complex to 1,4,5,8-tetrahydroxy- anthraquinone 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.

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