Oxalic acid, disodium salt

Oxalic acid, disodium salt. See Sodium oxalate Oxalic acid, hemipotassium salt. See Potassium tetraoxalate Oxalic acid, monopotassium salt. See Potassium acid oxalate Oxalic acid potassium salt. See Potassium oxalate... 

Sodium Oxalate Ethanedioic Acid Disodium Salt ... 

Synonyms Disodium ethanedioate Disodium oxalate Ethanedioic acid, disodium salt ... 

Of course the fluorescers used to transform the released energy from the reaction of hydrogen peroxide with these oxalic acid derivatives must also be water-soluble. Moreover they must be stable to attack by aqueous hydrogen peroxide. Among the fluorescers used [9,10] are RhodamineB, RhodamineG perchlorate, Sulforhodamine, and 9,10-diphenylanthracene-2,6-disulfonic acid disodium salt. Table 4 lists the presently available, most efficient water-soluble... 

Ethylenediamine tetraacetic acid (EDTA) [60-00-4] (Sequestrene), an anticoagulent at 1 mg of the disodium salt per mL blood, complexes with and removes calcium, Ca ", from the blood. Oxalate, citrate, and fluoride ions form insoluble salts with Ca " and chelate calcium from the blood. Salts containing these anticoagulants include lithium oxalate [553-91-3] 1 mg/mL blood sodium oxalate [62-76-0]2 mg/mL blood ... 

Alkylation of the dihydroxyacetophenone, 44, with epichloro-hydrin results in condensation of two molecules of the phenol with the latent glycerol (45). Reaction of the intermediate with ethyl oxalate affords the chromone ester, 46. Saponification leads to the bronchiodilator cromoglycic acid (47). The agent is usually administered by oral insufflation as its extremely insoluble disodium salt. 

If diethyl oxalate is utilised as the 1,2-dicarbonyl component, with sodium methoxide as base, a 3,4-dihydroxy thiophene is generated as its disodium salt, usually trapped by double 0-alkylation, as indicated in Scheme 46. Note that in this situation, the product of the ring synthesis is the 2,5-diester [75, 76], not an ester-acid. 

Ionization of dicarboxylic acids has been shown to have a profound effect on the decarboxylation rate. The disodium salt of malonic acid (NaOOCCH2COONa) was found to be relatively stable with respect to decarboxylation (Fairclough 1938) up to temperatures of 125 °C, whereas the monosodium salt decomposed by a first-order reaction. Rates for the decarboxylation of both malonic and oxalic acids were slower in polar solvents in which a high degree of ionization was expected (Richardson and O Neal 1972). Similarly, the rate of decomposition of dibromomalonic acid was found to be proportional to the concentration of the undissociated acid molecule in solution (Muus 1935). 

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