| abstract |
Triazolyl-styryl derivs., useful as optical brighteners, esp. for synthetic fibres, with fastness to chlorites, heat and bleaching agents have the formula (I): (where R1 is H, Cl or alkyl; R2 and R4 are each H, Cl, alkyl, phenyl, phenylalkyl, phenoxy, benzyloxy, alkoxy, cyano, or naphtholtriazolyl-2; R3 and R5 are each H, alkyl, alkoxy or cyano; R2 and R3 and/or R4 and R5 are together may be a condensed benzene ring; and R6 is H or CN). |