MONOAZO DYESTUFFS DERIVED FROM 2-HYDROXY-3-NAPHTHOIC ACID AMIDES

摘要

1537406 Monoazo dyestuffs derived from 2- hydroxy-3-naphthoic acid amides ROHNER AG PRATTELN 1 Oct 1976 [2 Oct 1975] 40843/76 Heading C4P Novel dyestuffs have the formula (wherein R 1 is C 2-4 alkylene, and R 2 is C 2-4 alkyl or C 3-4 alkanoyl, and R 1 and R 2 together contain 5 to 7 C). They are prepared by diazotizing 2- nitroaniline and coupling with 3-hydroxy-2- naphthoic acid or a derivative thereof. This coupling component may be (a) the amide already containing the -R 1 -O-R 2 substituent, in which case no further step is required, (b) the amide containing the -R 1 -OH substituent, in which case the product must be alkylated or acylated, or (c) the free acid, in which case the product must be converted to a halide or ester of the acid and then condensed with the amine H 2 N-R 1 -O-R 2 or with the amine H 2 NR 1 -OH and, in the latter instance, the resulting product alkylated or acylated. The novel dyestuffs have use in the coloration of textile materials comprising fibres of a linear aromatic polyester. Orange shades are produced.