EP 0000341 B1 19810225 - PROCESS FOR PREPARING PRACTICALLY PURE 1-AMINO-8-NITRO-4,5-DIHYDROXY ANTHRAQUINONE
Title (en)
PROCESS FOR PREPARING PRACTICALLY PURE 1-AMINO-8-NITRO-4,5-DIHYDROXY ANTHRAQUINONE
Publication
Application
Priority
DE 2730720 A 19770707
Abstract (en)
[origin: US4154747A] A process for the preparation of 1-amino-8-nitro-4,5-dihydroxyanthraquinone by partially reducing the corresponding dinitrohydroxyanthraquinone and isolating the reduction product, in which crude 1,8-dinitro-4,5-dihydroxyanthraquinone obtained by nitrating 4,5-dihydroxyanthraquinone is partially reduced in a phenol-water mixture, which contains from 5 to 50% by weight of water, in the presence of an alkali metal phenolate, by means of a reductone, reductonate or a mixture of these. The product is virtually free from by-products and is suitable for use for the synthesis of dyes.
IPC 1-7
IPC 8 full level
C07C 225/36 (2006.01)
CPC (source: EP US)
C07C 221/00 (2013.01 - EP US); C07C 2603/24 (2017.04 - EP US)
Designated contracting state (EPC)
BE CH DE FR GB
DOCDB simple family (publication)
DE 2730720 B1 19781109; DE 2730720 C2 19790712; DE 2860500 D1 19810402; EP 0000341 A1 19790124; EP 0000341 B1 19810225; JP S5416462 A 19790207; US 4154747 A 19790515
DOCDB simple family (application)
DE 2730720 A 19770707; DE 2860500 T 19780622; EP 78100217 A 19780622; JP 8153278 A 19780706; US 91725278 A 19780620