Rongalite Sodium formaldehyde

Sodium formaldehyde sulfoxylate dihydrate (sodium hydroxymethylsulHnate, Rongalite)... 

In the presence of sodium bicarbonate, sodium formaldehyde sulfoxylate (Rongalite) converts perfluoroalkyl iodides and bromides to the corresponding carboxylates Less decarboxylation to the monohydroperfluoroalkanes occurs when the bromides are used [16] (equation 17)... 

The reducing agent e.g. sodium formaldehyde sulfoxylate (Rongalite, C, BASF) must be selected in accordance with the legislation of the corresponding country. 

Disodium ditelluride can be prepared from tellurium and sodium in liquid ammonia, lithium triethylborohydride in THF, sodium borohydride in ethanol or THF" lithium or sodium in ethylenediamine , sodium hydride in DMF , hydrazine hydrate in aqueous sodium hydroxide , thiourea dioxide in DMF/THF/aqueous sodium hydroxide, and sodium formaldehyde sulfoxylate (Rongalite C) " in aqueous sodium hydroxide. The reducing agents compatible with organic solvents provide reaction media in which long-chain aliphatic halides are soluble. Such halides are insoluble in liquid ammonia, or aqueous media. 

The reaction of disodium telluride with alkyl halides is the oldest known method for the preparation of dialkyl telluriums. The required solutions of disodium telluride can be prepared from tellurium and sodium formaldehyde sulfoxylate (Rongalite C) in aqueous sodium hydroxide (Vol. IX, p. 1048), from tellurium and sodium in liquid ammonia " dimethylformamide or tetrahydrofuran in the presence of naphthalene , from tellurium and hydrazine hydrate/sodium hydroxide in water or dimethylformamide °, from tellurium and thiourea dioxide in aqueous tetrahydrofuranor from tellurium and sodium borohydride in methanol, ethanol, tetrahydrofuran, or aqueous sodium hydroxide ... 

Dihydro-l//-2-benzotelliirin (Rongalite Method) 34 g (0.17 mol) of sodium formaldehyde sulfoxylate, 26 g (0.65 mol) of sodium hydroxide, and 100 ml of water are placed in a flask fitted with a stirrer, a reflux condenser, and a nitrogen inlet tube. The flask is flushed with nitrogen, 15 g (0.12 mol) of fine tellurium powder is added, and the mixture is stirred and heated on a water bath for 30 min. 100 ml of ethanol and a solution of 25 g(0.09 mol) of 2-(2 -bromoethyl)benzyl bromide dissolved in 150 m/ofhot ethanol are added. The mixture is stirred and heated under reflux for 2 h, the ethanol is distilled off, and the residue is ground, then extracted with a mixture of 300 ml of water and 300 ml of diethyl ether. The diethyl ether layer is separated, washed with water, dried with anhydrous sodium sulfate, filtered, and fractionally distilled yield 8.5 g b.p. 116-126°/0.3 torr. The residue from the extraction is boiled with 50 ml of ethanol, the mixture is filtered hot, and the filtrate allowed to cool. The erystals are collected (3.8 g) and the combined product fractions are recrystallized from methanol whereby the methanol solution is cooled in dry ice yield 12.3 g (54%) m.p. 64°. 

A13-23356 EINECS 212-800-9 Formaldehyde sodium bisulfite Formbis HSDB 5766 Hydroxymethanesulfonic acid, monosodium salt Methylolsultonic acid sodium salt Monosodium hydroxymethanesulfonate NSC 2441 Rongalit C Sodium formaldehyde bisulfite Sodium hydroxymethanesulfonate Sodium hydroxymethane-sulphonate. Reducing and discharge agent for textile printing. Needles mp = 200°. BASF Corp. 

Various hyposulphite compounds are used for industrial purposes including stable aldehyde compounds. Of these the formaldehyde compound (Formosul) is tie most important, since it is the reducing agent almost universally employed in applying vat dyes by printing methods to textile materials. The less stable sodium hydrosulphite is used in dyeing with vat dyes. Stable zinc compounds (Rongalite) are also on the market. 

A reliable method for detecting Rongalite (and differentiating it from sodium hydrosulfite) is based on the detection of its formaldehyde component. This is easily accomplished by the color reaction with chromotropic acid. Details have been given elsewhere. ... 

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