Detail of "23128-51-0"

Reference

Disperse azo dyes

Disperse azo dyes. (Sumitomo Chemical Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58104952 A2 22 Jun 1983 Showa, 8 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09B029-08; D06P001-18. APPLICATION: JP 81-203996 16 Dec 1981. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) In manuf. of I (R = halogen; R1, R2 = H, C1-8 alkyl, COR5, CO2R5; R3 = H, OR5; R4 = H, NHCOR5, NHBz; R5 = H, C1-8 alkyl) by coupling of diazotized dinitroanilines with the appropriate couplers, the reaction mixt. 1817-73-8 is also in the experiment., upon completion of the coupling, is neutralized if necessary, heat-treated with a hydrophobic org. solvent, freed from the org. solvent, and filtered to give I having excellent dispersibility and agglomeration resistance at high temp. Thus, the coupling product of diazotized 2-bromo-4,6-dinitroaniline [1817-73-8] and 5-[bis(2-acetoxyethyl)amino]-4-methoxyacetanilide [23128-51-0] in 5% H2SO4 was neutralized with an alkali, treated with toluene [108-88-3], heated at 80° for 2 h, freed from toluene in vacuo, filtered, and washed to give I (R = Br; R1 = R2 = Ac; R3 = OMe; R4 = NHAc) [3618-72-2] having better dispersibility and agglomeration resistance in a bath for dyeing polyester fibers at 115-116° than a control prepd. without the heat treatment with toluene. .