Abstract
5-Nitro-2, 3-dichloro-1, 4-naphthoquinone (1a) and its derivatives (2a)-(7a) were synthesized. These were reduced with S2O3 in conc. H2SO4 to give 2, 3-dichloro-1, 4-dihydroxy-5, 8-naphthoquinone-8-imine (1b) and its derivatives (2b)-(7b), their maximum light absorbancy and dyeing ability of acetate, Vinylon, Amylan and Terylen have been investigated. Of these compounds tested, (1b) and (4b) showed excellent and clear dyeing than others. Among the textiles tested for dyeing, Amylan was the best with some dullness while Vinylon was slightly inferior than others. Terylen showed the same dyeing efficiency as that of acetate by dyeing at 100°C without carrier. Fastness of dyes was superior in Therylen and inferior in other fibers.
