Abstract: An anthraquinone compound represented by formula (1): (where R1 and R4 represent —H, a C1-C12 alkyl group, a C1-C12 alkyl group, a halogen atom, —CO2R9, —OCOR9, —COR9, a cyano group, or —CF3, R2, R3, R5 and R6 represent —H, a C1-C4 alkyl group, a C1-C4 alkoxy group, a halogen atom, —CO2R9, —OCOR9, —COR9, a cyano group, or —CF3. R7 and R8 represent —H, a C1-C12 alkyl group, or a C1-C12 alkoxy group. R9 represents a C1-C12 alkyl group, or a substituent represented by formula (a) (where R10 represents —H, a C1-C8 alkyl group, or a C1-C8 alkoxy group) or formula (b) (where R11 represents —H or a C1-C8 alkyl group); however, at least one of R1 through R6 represents a halogen atom, —CO2R9, —COR9, a cyano group, or —CF3).

Abstract: A novel compound with anthraquinone structure and having the following foluma (I): 1

Abstract: This invention is to provide a novel quinizarin compound which has a quinizarin structure represented by a following formula (1) having one to four of the 5, 6, 7, and 8 positions and at least either the 6 or 7 position formed of at least one member selected from the class consisting of secondary amino groups, alkylthio groups, and optionally substituted phenylthio groups, and having the remaining positions thereof formed of at least one member selected from the class consisting of hydrogen atom, halogen atoms, amino group, hydroxy group, alkoxy groups, and optionally substituted phenoxy groups, a method for the production thereof, and a dye, an electrophotographic grade color toner composition, a thermal-transfer recording sheet, an optical recording medium, an ink jet grade ink composition and a color filter severally comprising the quinizarin compound.

Abstract: This invention is to provide a novel quinizarin compound which has a quinizarin structure represented by a following formula (1) having one to four of the 5, 6, 7, and 8 positions and at least either the 6 or 7 position formed of at least one member selected from the class consisting of secondary amino groups, alkylthio groups, and optionally substituted phenylthio groups, and having the remaining positions thereof formed of at least one member selected from the class consisting of hydrogen atom, halogen atoms, amino group, hydroxy group, alkoxy groups, and optionally substituted phenoxy groups, a method for the production thereof, and a dye, an electrophotographic grade color toner composition, a thermal-transfer recording sheet, an optical recording medium, an ink jet grade ink composition and a color filter severally comprising the quinizarin compound.

Abstract: 1-Nitroanthraquinone-2-carboxylic acids of the general formula I ##STR1## where X is hydrogen, chlorine or bromine, are prepared by oxidizing a 1-nitro-2-methylanthraquinone of the general formula II ##STR2## with nitric acid in an organic reaction medium.