Reactivity,chemical selectivity and exhaust dyeing properties of dyes possessing a 2-chloro-4-methylthio-s-triazinyl reactive group

摘要

Several 2-chloro-s-triazinyl reactive dyes,each possessing a different substituent in the 4-position of the triazine ring,were synthesised,and their rates of hydrolysis and methanolysis were determined over a range of temperatures.The order of reactivity was 4-alkylthio > 4-methoxy > 4-dimethylamino.Unlike the 4-methylthio-and 4-dimethylarnino-derivatives,in which the chlorine atom was replaced cleanly,both on hydrolysis and methanolysis,the 2-chloro-4-methoxy-s-.triazine underwent concurrent displacement of both chlorine and methoxy sub-stituents.The 2-chloro-4-methylthio-derivative displayed a high propensity to undergo methanolysis,rather than hydrolysis,in homogeneous solution and this preference for undergoing alcoholysis was mirrored in excellent fixation to cotton on exhaust dyeing.