To obtain a new epindolidione pigment exhibiting yellow color having excellent chromatic characteristics such as coloring power and clearness, having excellent light resistance, solvent resistance, water resistance, etc., and useful as a coloring agent for printing ink, coating material, plastics, etc.
This compound is expressed by the formula (R1 to R8 are each H or a halogen and three or more of R1 to R4 are each a halogen), e.g. 1,2,3,6,7,8-hexafluoro-5,11-dioxo-6H,12H-diaza5,6,11,12-tetrahydronaphthacene. The compound of the formula e.g. having a symmetric chemical structure can be produced by esterifying dihyclroxyfumaric acid, carrying out the dehydrative condensation reaction of the ester with a halogenated aniline and subjecting the obtained compound to two condensation cyclization reactions.
ENDO ATSUSHI