Thiadiazolyl azo cpds - for dyeing polyamides pink or scarlet

摘要

A cpd. of formula:- where R is lower alkyl, X is -O- or -S-, A is lower alkanoyl, opt. substd. by Cl, Br, aryl, CN, lower alkoxy, benzyloxy, lower alkyl thio, or lower alkyl sulphonyl, lower alkyl sulphonyl, lower alkoxy carbonyl, cyclohexylcarbonyl, aroyl, carbamoyl, or lower alkyl carbamoyl (aryl gps. are phenyl opt. substd. by lower alkyl, lower alkoxy, Cl, or Br), R1 and R2 are H or lower alkyl, one or R1 and R2 being H, and R3 is (furyl)alkyl, thienylalkyl or pyrrolylalkyl contng. 1-6C.