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US 3,947,477 AGranted
Process for the preparation of aminohydroxyanthraquinones
AssigneeBayer Aktiengesellschaft
InventorHorst Jager
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Abstract
Preparations of compounds of the formula ##SPC1## Wherein R denotes a hydrocarbon residue and A can be substituted further by conversion of o-phthalic acids of the formula ##SPC2## Or their anhydrides with amines of the formula ##SPC3## In boric aicd/sulphuric acid.
Claims2
Process for the preparation of a compound of the formula ##SPC9##
- which comprises heating to a temperature of 100.degree.-180.degree.C in concentrated sulfuric acid in the presence of boric acid
- 1. a mixture of an o-phthalic acid of the formula ##SPC10##
- or its anhydride and an amine of the formula ##SPC11##
- or 2. an amide of the formula ##SPC12##
- or 3. an imide of the formula ##SPC13##
- wherein
- R is hydrogen, C.sub.1 -C.sub.4 -alkyl, or cyclohexyl;
- and
- A is unsubstituted or substituted by fluoro, chloro, bromo, sulpho, carboxy, methoxy, ethoxy, methyl, ethyl, nitro, or C.sub.1 -C.sub.4 -alkylcarbonylamino.
6 more elements
Dependencies are inferred from the claim text.