Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1984-10-02
1987-04-21
Hollrah, Glennon H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
260354, 260358, 260362, 260367, 260368, C07C 9724, C07D47122
Patent
active
046598316
ABSTRACT:
The invention relates to a process for the preparation of anthraquinone imides by condensing vattable anthraquinone compounds which contain at least one primary amino group with aromatic halogen compounds, in an organic solvent and at elevated temperature in the presence of a base and a copper catalyst. The process comprises first carrying out the condensation until a reaction of 60-95% has taken place, and then subjecting the reaction mixture, without isolating the reaction product, to an aftertreatment at a temperature which is 5.degree. to 60.degree. C. above the initial temperature of the condensation. This process permits the anthraquinone imides to be obtained in increased yield and additionally provides products with improved qualities. The intermediates so obtained can be further processed to vat dyes.
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patent: 2420022 (1947-05-01), Tinker et al.
patent: 2585682 (1952-02-01), Randall et al.
patent: 4382034 (1983-05-01), Reubke et al.
Ciba-Geigy AG
Covington Raymond
Hollrah Glennon H.
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