7336-20-1Relevant articles and documents
Liquid fluorescent whitener and preparation method thereof
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Paragraph 0071; 0072; 0119; 0120; 0167; 0168, (2017/01/02)
The invention relates to a liquid fluorescent whitener and a preparation method thereof, and belongs to the technical field of special assistants for printing, dyeing and papermaking. A technical problem to be solved is providing the liquid fluorescent whitener and the preparation method thereof. The effective component of the fluorescent whitener is 4,4'-bis[(4-anilino-6-Ramino acid)-1,3,5-triazinyl-2-yl)amino]stilbene-2,2'-tetrasulfonic acid tetrasodium salt, wherein R is a phenyl ring-containing amino acid group. The preparation method comprises the following steps: mixing 4,4'-diaminostilbene-2,2'-disulfonic acid with a NaOH solution to prepare a sodium 4,4'-diaminostilbene-2,2'-disulfonate solution product I, and mixing amino acids with the NaOH solution to prepare an amino acid sodium salt; adding an emulsifier, concentrated hydrochloric acid, cyanuric chloride and sodium sulfanilate to ice water, and reacting to generate a product II; adding the product I to the product II to generate a product III; and adding the amino acid sodium salt to the product III to obtain a crude whitener IV, carrying out pumping filtration, and carrying out desalting concentration to obtain the liquid fluorescent whitener.
Green synthesis of silver nanoparticles using Terminalia cuneata and its catalytic action in reduction of direct yellow-12 dye
Edison, Thomas Nesakumar Jebakumar Immanuel,Lee, Yong Rok,Sethuraman, Mathur Gopalakrishnan
, p. 122 - 129 (2016/04/04)
Facile green synthesis of silver nanoparticles (AgNPs) using aqueous bark extract of Terminalia cuneata has been reported in this article. The effects of concentration of the extract, reaction time and pH were studied by UV-Vis spectroscopy. Appearance of yellow color with λmax around ~ 420 nm suggested the formation of AgNPs. The stable AgNPs were further characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS) with zeta potential and high resolution transmission electron microscopy (HR-TEM) with energy dispersive X-ray spectroscopy (EDS) analysis. The synthesized AgNPs were in the size range of 25-50 nm with a distorted spherical shape identified from HR-TEM analysis. The catalytic activity of AgNPs on the reduction of direct yellow-12 using NaBH4 was analyzed using a UV-Vis spectrophotometer. This study showed the efficacy of biogenic AgNPs in catalyzing the reduction of direct yellow-12.
PROCESS FOR PREPARATION OF DISODIUM STILBENEDISULFONATES
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Page/Page column 13-14, (2009/03/07)
The present invention relates to a process for preparing sodium benzenesulf onate, more specifically, to a process for preparing sodium benzenesulfonate, which comprises the steps of a) reacting 2-X-4, 6-dichloro-l, 3, 5-triazine with a benzenesulf onic acid, 2, 2- (1, 2-ethenediyl) bis [5-amino] - disodium salt to produce a mixture; b) adding cyanuric chloride to the mixture from a); c) adding the compound, XH to the mixture from b) to produce a benzenesulf onic acid, 2,2'- (1, 2-ethenediyl) bis [5- (4-X-β-chloro-l, 3, 5-triazine-2- yl) amino] disodium salt; and d) separating and purifying the product to obtain the final benzenesulf onic acid, 2, 2'- (1,2- ethenediyl) bis [5- (4-X-β-chloro-l, 3, 5-triazin-2-yl) amino] - disodium salt [wherein, X represents an organic substituent].
Process for the preparation of 4,4'-dinitrostilbene-2,2'-disulfonic acid and its salts
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, (2008/06/13)
A process for the preparation of 4,4'-dinitrostilbene-2,2'-disulfonic acid and its salts, of the formula STR1 in which M is hydrogen or an alkali metal cation, by oxidation of 4-nitrotoluene-2-sulfonic acid in organic solvents, and also the reduction of the resulting acid or salt, without isolation, to give 4,4'-diamino- or (4-amino-4'-nitro)-stilbene-2,2'-disulfonic acid or salts thereof.
Electrochemical behaviour of bisazodye-chrysophenine
Goyal, R. N.,Kumar, Anoop
, p. 577 - 580 (2007/10/02)
The electrochemical behaviour of the bisazodye-chrysophenine has been studied in the pH range 3.0-10.3 at the dropping mercury electrode and at the pyrolytic graphite electrode.On the basis of polarographic, cyclic voltammetric, coulometric and spectral studies it is concluded that unlike bisazobenzene, where a first 4e, 4H+ process gives the bishydrazo derivative, the cleavage of one of the azo group occurs in this dye.This difference in behaviour is explained on the basis of strongly electron donating substituents present in chrisophenine.The products of electroreduction have been separated and identified.
SYNTHESIS AND TRANSFORMATIONS OF 2,7-DISUBSTITUTED BENZOTHIENOBENZOTHIOPHENES
Zherdeva, S. Yu.,Barudi, A.,Zheltov, A. Ya.,Stepanov, B. I.
, p. 383 - 390 (2007/10/02)
A new method was developed for the synthesis of 2,7-disubstituted benzothienobenzothiophenes by the reaction of 4,4'-disubstituted 2,2'-stilbenedisulfonyl chloride with hydriodic acid and subsequent treatment of the reaction products with perbromopyridinium bromide.From 2,7-dinitrobenzothienobenzothiophene a series of new derivatives containing various electron-donating and electron-withdrawing substituents were obtained.