Manufacture of 1-amino-2-alkoxy-4-hydroxyanthraquinones

Details Manufacture of 1-amino-2-alkoxy-4-hydroxyanthraquinones Manufacture of 1-amino-2-alkoxy-4-hydroxyanthraquinones

1975-01-31

1976-07-06

Demers, Arthur P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260383, C07C 9726

Patent

active

039681319

ABSTRACT:
An improvement in the process for the manufacture of 1-amino-2-alkoxy-4-hydroxyanthraquinones by reaction of primary, saturated, linear or branched aliphatic alcohols, which may contain further substituents, with 1-amino-2-phenoxy-4-hydroxyanthraquinone or 1-amino-2-methoxy-4-hydroxyanthraquinone in the presence of alkaline reagents, which consists in carrying out the reaction in the presence of polyethylene glycols of molecular weight above 150. The presence of the polyethylene glycol facilitates the reaction and as a result high yields of reaction product are obtained even with alcohols which react incompletely, if at all, in prior processes.

REFERENCES:
patent: 2844598 (1958-07-01), Gunthard
patent: 3530150 (1970-09-01), Rickenbacher
patent: 3557155 (1971-01-01), Yamada
patent: 3642835 (1972-02-01), Hederich et. al.
patent: 3704252 (1972-11-01), Bien et. al.
patent: 3779700 (1973-12-01), Wegner et al.

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