Di sodium salt

This can be seen from the titration curve for phosphoric acid [6] shown in Figure 10.2. In practice the mono- and di-sodium salt system is used most extensively, since this covers the pH range over which precise control is most often needed. These phosphate buffers are more resistant than the acetate systems to temperature-induced changes. 

During a very early study on tetramethylcyclobutadiene16 it was anticipated by one of us that 2,2,4,4-tetramethyl-l,3-dicarbenacyclobutane formed in the pyrolysis of dry di-sodium salt of 2,2,4,4-tetramethyl-l,3-cyclobutanedione-bisto-sylhydrazone might be a reasonable precursor for the cyclobutadiene derivative. But the only product — isolated in a cooling trap — was tetramethylbutatriene. 

Since, in Kolbe s synthesis, as here described, the mono-sodium salicylate reacts to some extent with unchanged sodium phenoxide, producing the di-sodium salt, part of the phenol is liberated and excluded from the reaction. The reaction proceeds to completion if the sodium phenoxide is heated to about 150° for a long time, with carbon dioxide under pressure in the autoclave. This is the technical method of Schmitt. 

Mercury dibromofluorescein (mercurochrome, merobromin), [2, 7 -dibromo-4 -(hydroxymercurio)-fluorescein di sodium salt] [129-16-8] M 804.8, m>300°. The Na salt is dissolved in the minimum vol of H2O, or the free acid suspended in H2O and dilute NaOH added to cause it to dissolve, filter and acidify with dilute HCl. Collect the ppte wash with H2O by centrifugation and dry in vacuum. The di Na salt can be purified by dissolving in the minimum volume of H2O and ppted by adding EtOH, filter, wash with EtOH or Me2CO and dry in a vacuum. Solubility in 95% EtOH is 2% and in MeOH it is 16%. [JACS 42 2355 1920]. 

Acetylene itself can form both the mono- or di-sodium salt the former is the main product when a large excess of acetylene is used in the reaction with soda-mide in liquid ammonia. 

Rose bengal is a uranine analog and was first synthesized by Gnehm 11 years after Baeyer discovered fluorescein.18 It is sold at dye grade as 90% the di-sodium salt of... 

The studies carried out on the alcohol distillate obtained from the co-transesterification of dimethyl terephthalate with ethylene glycol in the presence of the sodium salt of diethyl phosphite or the di-sodium salt of 1,2-dicarbomethoxyethylphosphonic acid in various concentrations showed (Table I) that the side reactions were markedly suppressed. 

With the di-sodium salt of 1,2-dicarbomethoxyethylphosphonic acid a resin of the following structure (4) was obtained... 

With the di-sodium salt of 1,2-dicarbomethoxyethylphosphonic acid as modifier the diethylene glycol content and the carboxyl group content is very low (Table III). These results indicate that the used modifier has also thermostabilizing properties. The integral and differential curves (Fig.2) of molecular mass distribution show that the polydispersity of modified resin is comparable to that of the un-modified. 

The samples modified with the di-sodium salt of 1,2-dicarbometho-xyethylphosphonic acid showed (Table IV) the weight of residue reaching 52%. 

Weidenauer, U., Bodmeier, D., and Kissel,T. (2003), Microencapsulation of hydrophilic drug substances using biodegradable polyesters. Part I Evaluation of different techniques for the encapsulation of pamidronate di-sodium salt, J. Microencapsul., 20, 509-524. 

Lu, B., Jonsson, R, and Blomberg, S. Reversed phase ion-pair high performance liquid chromatographic gradient separation of related impurities in 2,4-disulfonic acid benzal-dehyde di-sodium salt. J. Chromatogr. A. 2006, 1119, 270-276. 

Examples of linear van t Hoff relationships can be found in the literature. Almost linear relationships between InA versus 1/T were reported for alkaloids under IPC conditions at a temperature range of 10 to 50°C with a linear decrease of retention with the increase of temperature [10]. A linear van t Hoff plot was also obtained in IPC of impurities in 2,4-disulfonic acid benzaldehyde di-sodium salt [21], even if nonlinear dependencies were also reported [22],... 

Translucent crystals obtained from di-sodium salt Na2ReFl9 by slow evaporation of a solution in KOH unstable in moist air ordered structure (Figure 33) from single-crystal X-ray diffraction at 193 K, and IR data Pnma, Z = 4 Re site forming ttp-[ReH9] 18-electron complexes with site symmetry m surrounded by K and Na cations in... 

Ethylenediaminetetracetic acid (EDTA), usually as the di-sodium salt, is added to a concentration of 1 mM to chelate heavy metal ions, which can inhibit enzymes at very low concentrations, and also to remove Ca2+ and Mg2+, which can otherwise act... 

As the molsidomine case shows, the photodegradation of drugs in the solid state can be enhanced by the use of colorants. Another example of this approach are ethinyl estradiol tablets which can be stabilized by the addition of erythrosine (FD C Red No. 3) but degrade faster if they contain l-p-sulfophenylazo-2-naphthol-6 sulfonate, di-sodium salt (FD C Yellow No. 6) (14). 

When neutral or acid phenolphthalein, a lactone inner anhydride which is colorlessj is treated with sodium hydroxide to just alkaline reaction, hydrolysis first takes place yielding the carbinol. This is then neutralized by the alkali yielding a di-sodium salt, one sodium entering the carboxyl group and the other entering one of the phenol... 

Example Pt3Q9phen phen = 4,7-Diphenyldisulfonic-acid-1,10-phenanthroline-di-sodium salt... 

The formula II is preferred over I, since it has been shown from measurements of the dissociation constants that two hydrogen atoms are probably held in the form of zwitter ions. For the purpose of simphcity we shall assign the formula H Y to EDTA the di-sodium salt is therefore Na2H2Y and affords the complex-forming ion H2Y2 in aqueous solution it reacts with all metals in a 1 1 ratio. The reactions with cations 1VP+, can be written in the general form as ... 

Quick, Adams, J. Am. Chem. Soc. 44, 809 (1922). The di-sodium salt is easily prepd by treating sodium arsenite with dimethyl sulfate at 85 Uhlinger, Cook, Ind. Eng. Chem. 11, 105 (1919). Other routes are by the reaction of methyl chloride with sodium arsonate under pressure Miller et al, U.S. pat. 2,442,372 (1948) by the reaction of dimethyl sulfate with a solution of arsenic trioxide in sodium hydroxide Schwerdle, U.S. pat. 2,889,347 (1959). Acute toxicity T. B. Gaines, R. E. Linder, Eundam. Appl. Toxicol 7, 299 (1986). 

Ethenediyl)bis(5-nitrobenzenesulfonic acid), di-sodium salt. Benzenesulfonic acid, 2,2 -(1,2-ethenediyl)bis(5-nitro-, disodium salt 4,4 -Dinitrostilbene-2,2 -disulfonic acid, disodium salt Disodium 4,4 -dinilro-2,2 -stilbene-disulfonic acid Disodium 4,4 -dinitro-2,2 -stilbene-disulfonate Disodium 4,4 -dinitrostilbene-2,2 -disulphon-ate EINECS 223-051-2 NSC 163175 2,2 -Stilbenedisulfonic acid, 4,4 -dlnltro-, disodium salt. 

EINECS 249-559-4 (l-Hydroxyethylidene)bisphosphonio acid, sodium salt 1-Hydroxyethanediphosphonic acid, sodium salt Hydroxyethylidene diphosphonic acid, sodium salt Phosphonic acid, (l-hydroxyethylidene)di-, sodium salt. 

The heterocyclic sulphamate 86 has been synthesized96. The sulphamates 87-92 were synthesized to help probe and extend the existing taste relationships in this field98. The mono- and di- sodium salts of antipyrine sulphamate (93) have been prepared by the reduction of nitrosopyrine with a sulphite-bisulphite mixture112. 

Mercaptosuccinic acid, monogold (1+) sodium salt Butanedioic acid, mercapto-, monogold (1+) sodium salt (A mixture of the mono- and di-sodium salts of gold thiomalic acid) Gold Sodium Thiomalate USP ... 

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