3-Cyano or acyl-4-aryl-5-arylazo-6-hydroxypyridone-2 dyes

DETAILED DESCRIPTION 1.
A compound of the formula wherein R.
sub.
1 is phenyl, substituted phenyl, naphthyl or substituted naphthyl, wherein each substituent of substituted phenyl and substituted naphthyl Is independently chloro, bromo, hydroxy, cyano, nitro, trifluoromethyl, alkyl, substituted alkyl, alkoxy, substituted alkoxy, acyl, acyloxy, acylamino, formyl, morpholinosulfonyl, piperidinosulfonyl, morpholinosulfonyloxy, aziridinoslfonyloxy, peripidinoslfonyloxy, alkylsulfamoylamilino, phenylsulfamoylanilino, dinitroanilino, alkylcarbonylaminophenyl, dinitrophenyl, phenylazo, nitrophenylazo, dichlorophenylazo, bromophenylazo, cyanophenylazo, methoxyphenylazo, ethoxyphenylazo, tolylazo or acylphenylazo, wherein each substituent of substituted alkyl and substituted alkoxy is independently chloro, bromo, alkoxy, phenyl, cyano, hydroxy or acyloxy, R.
sub.
2 is cyano, acyl, thienylcarbonyl or pyridylcarbonyl, and R.
sub.
3 is phenyl, naphthyl, thiazolyl, benzothiazolyl, thienyl, pyrrolyl, furyl, pyridyl, imidazolyl or benzimidazolyl, or a substituted derivative thereof, wherein each substituent is independently chloro, bromo, alkyl, substituted alkyl, alkoxy, substituted alkoxy, hydroxy, trifluoromethyl, cyano, thiocyano, nitro, alkylamino, dialkylamino, acyl, acyloxy or acylamino, wherein each substituent of substituted alkyl and substituted alkoxy is independently chloro, bromo, alkoxy, phenyl, cyano, hydroxy or acyloxy, wherein each acyl and acyl radical of each acyloxy, acylamino and acylphenylazo is independently R--X-- or R'--Y', wherein R is lower alkyl, substituted lower alkyl, cyclohexyl, phenyl or substituted phenyl, wherein each substituent of substituted lower alkyl is independently chloro, bromo, alkoxy, phenyl, cyano, hydroxy or acyloxy, and each substituent of substituted phenyl is independently chloro, bromo, hydroxy, cyano, nitro, trifluoromethyl, alkyl or alkoxy, X is --CO--, --O--CO-- or --SO.
sub.
2 --, R' is hydrogen or R, and Y is --NR'--CO-- or --NR'--SO.
sub.
2 --, and each alkyl, alkoxy and alkyl and alkoxy radical of each substituted alkyl, substituted alkoxy, alkylsulfamoylanilino, alkylcarbonylaminophenyl, alkylamino and dialkylamino independently has 1 to 10 carbon atoms