Detail of "137-50-8"

Reference

Preparation of 2,4-diaminobenzenesulfonic acid

Preparation of 2,4-diaminobenzenesulfonic acid. Kono, Kazuhito; Nakai, Tadao; Hayakawa, Kazuhiko (Nissan Chemical Industries, Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 04013657 A2 17 Jan 1992 Heisei, 3 pp. (Japan). CODEN: JKXXAF. CLASS: ICM: C07C309-46. ICS: C07C303-06. APPLICATION: JP 90-118273 8 May 1990. DOCUMENT TYPE: Patent CA Section: 25 (Benzene, Its Derivatives, and Condensed Benzenoid Compounds) The title compd. (I) is prepd. selectively by sulfonation of 2,4-diaminobenzene (II) and heating the reaction mixt. at 160-180°. A soln. of II in H2SO4 was bubbled with SO3 at 153-157° to give 0..241 mol mixt. of I and 2,4-diaminobenzene-1,5-disulfonic acid, and the reaction mixt. was stirred at 175° for 20 min to give 94.7% I.Except for chemicals metioned above, 137-50-8 and 108-45-2 are also used. .

Nickel phthalocyanine reactive azo dyes, their preparation and use

Nickel phthalocyanine reactive azo dyes, their preparation and use. Ridyard, Denis Robert Annesley; Renfrew, Andrew Hunter Morris (Imperial Chemical Industries PLC, UK). Eur. Pat. Appl. EP 471456 A1 19 Feb 1992, 10 pp. DESIGNATED STATES: R: AT, BE, CH, DE, DK, ES, FR, GB, IT, LI, NL, SE. (European Patent Organization). CODEN: EPXXDW. CLASS: ICM: C09B062-10. ICS: D06P001-38. APPLICATION: EP 91-306641 22 Jul 1991. PRIORITY: GB 90-17863 15 Aug 1990. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 40, 45 The dyes are represented in the free acid form as I [A = (un)substituted phenylene or C1-6-alkylene; Q is a labile substituent; R = NiPc(SO3H)r(SO2NHR1)p; Pc = phthalocyanine; R1 = H, (un)substituted alkyl or aryl; R2-R4 = H, (un)substituted C1-6-alkyl; R5 = (un)substituted phenylene; X, Y = H, alkyl, alkoxy, halo, CO2H, SO3H; Z = H, alkyl; m, r = 1-3; p = 0-1; (m + p + r) ￡ 4] and are useful for coloring materials having OH or NH groups. NiPc was chlorosulfonated, and the product condensed with monoacetyl-m-phenylenediamine-HCl to give a base (II). A 1:1 condensate of 4,6-diamino-1,3-benzenedisulfonic acid and cyanuric chloride was diazotized and coupled with 5-amino-3-methyl-1-phenylpyrazole; the product was added slowly to II to give I (A = m-C6H4, Q = Cl, R2 = R3 = R4 = X = Y = H, R5 = 4,6-disulfo-m-phenylene, Z = Me, m = 1.3, p = 0, r = 2.In this experiment, several chemicals are used like 108-77-0 and 137-50-8 7), yellowish green on cellulosic fibers and green on leather. .