Novel water-soluble azo compounds useful as raw materials for preparing dyes excellent in dyeing properties and fastness and prepared from a coupler consisting of 2-hydroxynaphthalene-3,6-dicarboxylic acid or an ester thereof or an amide derivative of the same and a diazonium compound having a group of the general formula: -B-(CH2)2-Q or -B'-(CH2)2-Q' (wherein B and B' are each an electron-attracting group; and Q and Q' are each a group capable of forming a vinyl group through the elimination with an alkali, provided the groups Q and Q' are each bonded at the β-position of the ethyl group).
新型
水溶性偶氮化合物,可作为制备染色性能和牢度优异的
染料的原料,由 2-羟基
萘-3,6-二
羧酸或其酯或其酰胺衍
生物和具有通式基团的重氮化合物组成的
偶联剂制备:-B-(
CH2)2-Q或-B'-( )2-Q'(其中B和B'各自为引电子基团;Q和Q'各自为能通过与碱消去形成
乙烯基的基团,条件是基团Q和Q'各自键合在乙基的β位)。