FIELD: varnish-and-paint industry. SUBSTANCE: dye is prepared by solid-phase interaction of quinaldine with phthalic anhydride for 4 h at temperature gradually raised from 190-195 C to 215-220 C followed by sulfonation of intermediate quinophthalone with 65% of oleum. EFFECT: increased yield of product to 70-73%. 1 tbl, 17 ex
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