| abstract |
WATER-INSOLUBLE AZO-DYES FOR HYDROPHOBIC SYNTHETIC FIBRES. M2A. Are of formula:- (where X1 are nitro, cyano-(di)alkylsulphonyl; X2 is Cl, Br, nitro, cyano, or alkylsulphonyl; X3 is Cl, Br or (pref.) H; Y and H, alkyl, alkoxy or acylamine; Z is alkyl, alkoxy or (pref.) H; R1 is C3-10 alkenyl (pref. C3-4) and R2 is opt. substd. alkyl). Preparation comprises coupling a compound of formula:- with a compound of formula:-. |