Monoazo pyridone compound.

摘要

A pyridone compound of the following formula, or a salt thereof, <CHEM> wherein R1 and R2 are independently a hydrogen atom or a lower alkyl group having up to 4 carbon atoms. X is a hydrogen atom or methyl or sulfo group, A is an unsubstituted or substituted phenylene or naphthylene group, and Y is -SO2CH=CH2 or -SO2CH2CH2Z, in which Z is a group capable of being split by the action of an alkali. The compound is useful for dyeing or printing fiber materials to give a dyed product of a brilliant yellow color excellent in various fastness properties with good reproducibility.