Detail of "128-42-7"

CAS Number:
128-42-7
Name:
Benzenesulfonic acid,2,2'-(1,2-ethenediyl)bis[5-nitro-
Superlist Name:
4,4'-Dinitrostilbene-2,2'-disulfonic acid
Molecular Structure:
Formula:
C₁₄H₁₀N₂O₁₀S₂
Molecular Weight:
430.38
Synonyms:
2,2'-Stilbenedisulfonicacid, 4,4'-dinitro- (6CI,7CI,8CI);4,4'-Dinitro-2,2'-stilbenedisulfonic acid;Dinitrostilbenedisulfonic acid;NSC 1793;
EINECS:
204-885-6
Density:
1.779 g/cm³

Controling a dye product by programmable automation: Controling a dye product by programmable automation. Nemecek, Zdenek; Dosoudil, Miloslav (Vychodoceske Chem. Zavody, N. P., Pardubice, Czech.). Chem. Prum., 34(7), 363-6 (Czech) 1984. CODEN: CHPUA4. ISSN: 0009-2789. DOCUMENT TYPE: Journal CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 25, 48 The application of a com. programmable logic control system for controlling discontinuous (batch-type) manuf. of dinitrostilbenedisulfonic acid [128-42-7], used as an intermediate in the manuf. of optical brighteners, is described.

4,4'-Dinitro-2,2'-stilbenedisulfonic acid: 4,4'-Dinitro-2,2'-stilbenedisulfonic acid. Wolter, Gerhard; Kojtscheff, Todor; Hollmann, Rudolf (VEB Chemiekombinat Bitterfeld, Ger. Dem. Rep.). Ger. (East) DD 204272 A1 23 Nov 1983, 12 pp. (German). (German Democratic Republic). CODEN: GEXXA8. CLASS: IC: C07C143-55. APPLICATION: DD 81-228228 12 Mar 1981. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 25 The title compd. (I) [128-42-7] is prepd. in higher yield and purity and shorter reaction time than in known processes by air oxidn. of 4-nitrotoluene-2-sulfonic acid (II) [121-03-9] in aq. alk. medium at relatively high temp. and alkali concn. and relatively low II concn. For example, a soln. of II 600 in H2O 1400 was fed during 3 h to H2O 9000, 50% aq. NaOH 800, and 5% Mn sulfate soln. 15 parts in an aeration reactor at 59°, and then heated at 1°/h to 63° and addnl. oxidized at 63° for 1 h. Adjustment of the pH to 6.5-7, addn. of 100 parts NaCl/1000 parts soln., and cooling gave the Na salt [3709-43-1] of I in 76.5% yield.