Preparation of 1-amino-4-hydroxy-2-(6'-hydroxyhexoxy)-anthraquin

Details Preparation of 1-amino-4-hydroxy-2-(6'-hydroxyhexoxy)-anthraquin Preparation of 1-amino-4-hydroxy-2-(6'-hydroxyhexoxy)-anthraquin

1988-08-10

1990-04-10

Raymon, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

552241, C07C 9726

Patent

active

049162446

ABSTRACT:
1-Amino-2-(6'-hydroxyhexoxy)-4-hydroxyanthraquinone (I) is prepared from the corresponding 2-phenoxy- or 2-halo-anthraquinone compound and 1,6-hexanediol with or without a phenol in the presence of an alkaline agent at elevated temperatures by reacting, per mole of the anthraquinone compound, from 2 to 6 moles of 1,6-hexanediol in the presence of ethylene oxide adducts on phenols or alkanols and/or polyethylene glycols at from 125.degree. to 135.degree. C. and then heating the resulting reaction mixture at from 140.degree. to 150.degree. C., in the course of which the stage 1 byproducts, namely the 1',6'-bis(1-amino-4-hydroxyanthraquinonyloxy)hexane diether is cleaved into (I), leaving a diether level of .ltoreq.2% by weight in (I).

REFERENCES:
patent: 3530150 (1970-09-01), Rickenbacher
patent: 3968131 (1976-07-01), Maier
patent: 4485043 (1984-11-01), Kniel

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