Process for preparing 4,4'-dibenzoylaminodianthrimidecarbazole
AssigneeBayer Aktiengesellschaft
InventorJosef Stawitz
Life of this patent
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Abstract
Process for preparing 4,4'-dibenzoylaminoanthrimidecarbazole, characterized in that 4,4'-diaminodianthrimide is benzoylated and carbazolated, both steps being carried out in one-vessel fashion and the 4,4'-diaminodianthrimide having been obtained by oxidizing a mixture of 1-aminoanthraquinone and 1,4-diaminoanthraquinone in a molar ratio of 0.9:1 to 1.4:1 in 30 to 60% strength H.sub.2 SO.sub.4 and then reducing.
Claims8
Process for preparing 4,4'-dibenzoylaminoanthrimidecarbazole, characterised in that 4,4'-diaminodianthrimide is benzoylated and carbazolated, both steps being carried out in one-vessel fashion and the 4,4'-diaminodianthrimide having been obtained by oxidising a mixture of 1-aminoanthraquinone and 1,4-diaminoanthraquinone in a molar ratio of 0.9:1 to 1.4:1 in 40 to 60% strength H.sub.2 SO.sub.4 and then reducing.
Dependencies are inferred from the claim text.