Process for the preparation of 4,4'-diamino-1,1'-dianthrimides
AssigneeBayer Aktiengesellschaft
InventorJosef Stawitz
Life of this patent
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Abstract
Process for the preparation of 4,4'-diamino-1,1'-dianthrimides, characterized in that a mixture of an optionally substituted 1,4-diaminoanthraquinone and an optionally substituted 1-aminoanthraquinone in 30-60% strength H.sub.2 SO.sub.4, preferably 40-60% strength H.sub.2 SO.sub.4, is oxidized with peroxomonosulphuric acid or peroxodisulphuric acid, which are preferably employed in the form of the alkali metal or ammonium salts, and the product is then reduced.
Claims13
Process for the preparation of 4,4'-diamino-1,1'-dianthrimides, characterized in that a mixture of an optionally substituted 1,4-diaminoanthraquinone and an optionally substituted 1-aminoanthraquinone in 30-60% strength H.sub.2 SO.sub.4, is oxidized with peroxomonosulphuric acid or peroxodisulphuric acid, and the product is then reduced.
Dependencies are inferred from the claim text.