Detail of "6201-86-1"

Reference

Oxazine dyes for leather

Oxazine dyes for leather. Jauer, Ernst Adolf; Thurm, Hans; Scheffler, Heinz; Keil, Alfred; Oschatz, Siegfried (VEB Chemiekombinat Bitterfeld, Ger. Dem. Rep.). Ger. (East) DD 203065 A1 12 Oct 1983, 7 pp. (German). (German Democratic Republic). CODEN: GEXXA8. CLASS: IC: C09B019-00. APPLICATION: DD 81-232415 6 Aug 1981. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 45 Water-sol., yellowish brown leather dyes (I; R = NO2, Cl, CO2H) are prepd. by condensing 5,4,3-R(HO)(H2N)C6H2SO3H (R as previously defined) with 2,3,5-R2R3(O2N)C6H2SO3H (R2 = halogen; R3 = halogen, NO2) in aq. 96-93-5 and 89477-76-9 are cas registry numbers of chemicals which are used as reagents here. soln. at 350° and pH >4. Thus, 2,3,5-Cl(O2N)2C6H2SO3H [4515-26-8] was slowly added to a stirred aq. soln. of 3,4,5-H2N(HO)(HO2C)C6H2SO3H [6201-86-1] and Na2CO3 at 95-100° while maintaining pH 8 by addn. of Na2CO3. Further heating followed by salting pptd. the Na salt [89477-76-9] of I (R = CO2H). The dye showed good penetration when applied to leather. .

Fluorescence reaction between 3-amino-5-sulfosalicylic acid and beryllium

Fluorescence reaction between 3-amino-5-sulfosalicylic acid and beryllium. Alykov, N. M.; Cherkesov, A. I. (S. M. Kirov Astrakhan Pedagog. Inst., Astrakhan, USSR). Zh. Anal. Khim., 31(6), 1104-8 (Russian) 1976. CODEN: ZAKHA8. DOCUMENT TYPE: Journal CA Section: 79 (Inorganic Analytical Chemistry) To det. Be, the complex formation between Be and 3-amino-5-sulfosalicylic acid (H3R) was studied fluorometrically in aq. solns. At pH 6.8-7.0, a max. yield of the product was obtained for a Be:H3R ratio of 3:1. [Be3(OH)3(H2O)6]3+ reacted with HR2- to form the fluorescent complex. Optimum conditions exist at 2 .times. 10-5M H3R in a pH 7 acetate buffer. The detection limit was 0.005 . 6201-86-1 and 7440-41-7 which are cas registry numbers of chemicals are mentioned.mu.g Be/ml. A method was described for Be detn. in biol. materials. A 1000-fold excess alkali and alk. earth elements and 10-fold excess Co, Ni, Mn, V, and Mo do not interfere. The interference of Fe(III), Al(III), and Zn(II) was eliminated by adding Complexon III. UO22+, PO43-, and citrate interfere. .