- Anthrapyridone compounds
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An anthrapyridone compound of the following formula (I) and which is useful for coloring resins: STR1 wherein X1 is hydrogen, --NHCOR1, --CONR2 R3, --COR4, --SO2 R5 or --SO2 NR6 R7, in which R1 and R4 are each C1-4 alkyl, R2 and R3 are each hydrogen or C1-4 alkyl, R5 is C1-4 alkyl or hydroxyethyl, R6 and R7 are each hydrogen or C1-4 alkyl, X2 is hydrogen or imidomethyl of the formula (II): STR2 wherein n is a number of 1 to 2, X4 is hydrogen or carboxylic acid C1-4 alkyl-ester, X3 is hydrogen, halogen, hydroxyl, C1-4 alkyl or C1-4 alkoxyl, with the proviso that X1 is --NHCOR1, --CONR2 R3, --COR4, --SO2 R5 or --SO2 NR6 R7 when X2 is hydrogen, X2 is the imidomethyl of the formula (II) when X1 is the hydrogen, is provided, which is prepared by allowing the α-halonathraquinone compound with an acylated primary aromatic amine compound in a nonaqueous medium in the presence of metallic copper or a copper compound.
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