Sodium hydrogen sulfite, solution

The addition products often are nicely crystalline solids that are insoluble in excess concentrated sodium hydrogen sulfite solution. Whether soluble or insoluble, the addition products are useful for separating carbonyl compounds from substances that do not react with sodium hydrogen sulfite. 

SYNS BISULFITE de SODIUM (FRENCH) HYDROGEN SULFITE SODIUM SODIUM ACID SULFITE SODIUM BISULFITE SODIUM BISULFITE (1 1) SODIUM BISULFITE, solid (DOT) SODIUM BISULFITE, solution (DOT) SODIUM HYDROGEN SULFITE SODIUM HYDROGEN SULFITE, soUd (DOT) SODIUM HYDROGEN SULFITE, solution pOT) SODIUM SULFHYDRATE SULFUROUS ACID, MONOSODIUM SALT... 

The naphthylamines may be prepared by reduction of the corresponding nitro compound, but they are readily accessible from naphthois by the Bucherer reaction The naphthol is heated, preferably under pressure in an autoclave, with ammonia and aqueous sodium hydrogen sulfite solution, when an addition-elimination sequence occurs. The detailed mechanism is not completely elucidated, but the Bucherer reaction is restricted to those phenols that show a tendency to tautomerize to the keto form, such as the naphthois and 1,3-dihydroxybenzene (resorcinol). Using 1-naphthol for illustration, the first step is addition of the hydrosulfite across the 3,4-double bond of either the enol or keto tautomer (Scheme 12.9). Nucleophilic attack by ammonia at the carbonyl group... 

The reaction between 2,l-bcnzisothiazol-3-aminc and aqueous sodium hydrogen sulfite solution affords 2-(2-aminophenyl)quinazolin-4(3//)-one (66%) via a sulfur extrusion mecha-... 

Add 5.0 mL of 0.01 M sodium hydrogen sulfite solution (NaHS03) to the potassium permanganate solution while stirring. Record your observations. 

Sodium disulfite is produced by reacting sulfur dioxide with 50 to 70% sodium hydroxide in saturated sodium hydrogen sulfite solution. Sodium disulfite is isolated from the resulting suspension by centrifugation and dried. Applications Sodium disulfite is utilized in the photo-, paper, textile and leather industries and in water treatment. 

For further examples, see ref 18. b Aqueous glyoxal. c Glyoxal as its hydrated polymer. d Glyoxal sodium hydrogen sulfite solution. 

SODIUM HYDROGEN SULFITE or SODIUM HYDROGEN SULFITE, SOLID or SODIUM HYDROGEN SULFITE SOLUTION (7631-90-5) Slowly oxidized to the sulfate on contact with air. Reactions with oxidizers or acids produce sulfur dioxide gas. Attacks many metals. 

Chloro-1-propanol Propene is led into an ice-cooled, rapidly stirred solution of chromyl chloride (1 mole) in CC14 (300 ml) until the Cr02Cl2 color has disappeared (absorption 23 g). The solid product that separates is hydrolysed by sodium hydrogen sulfite solution. The aqueous solution is saturated with salt and extracted with ether. The ether layer is dried over Na2S04 and distilled. The yield is 43%. 

The reaction is carried out at room temperature, with rapid stirring, the iodine solution (in aqueous KI or methanol) being dropped in slowly, at a rate depending on the consumption. Then concentrated sodium hydrogen sulfite solution is added and the whole is stirred so as to remove any excess of NI3. 

Fission by aqueous-alcoholic sodium hydrogen sulfite solution is recommended as an elegant method for regenerating carbonyl compounds from their oximes in high yield.951... 

Hydroxy-6-(phenylamino)-2-naphthalenesulfonic acid ( phenyl-y-acid ) 355g 6-Amino-4-hydroxy-2-naphthalenesulfonic acid ( y-acid ) (239 g of pure material), sodium hydrogen sulfite solution (25% S02 content 750 g), water (750 ml), and aniline (200 g) are heated together under reflux for 24 h. The mixture is then made alkaline with concentrated sodium carbonate solution, and the aniline is removed in steam. Acidification of the residue with hydrochloric acid precipitates the phenyl-y-acid in an almost pure state in 75-80% yield. 

Sodium nf-hydroxybenzenesulfonate 188 Resorcinol (100 g) and sodium hydrogen sulfite solution (d 1.32 11) are heated together for 22 h, then freed from sulfite and sulfate ions by addition of barium acetate, filtered, and concentrated to 500 ml. Addition of 85 % ethanol (11) precipitates trisodium l,3-dihydroxy-l,3,5-cyclohexanetrisulfonate (242.8 g). This salt (100 g) is dissolved in water (100 ml), treated with 50% sodium hydroxide solution (40 ml), and set aside overnight. The mixture is next neutralized with sulfuric acid, treated with hot 85 % ethanol (400 ml), filtered, and evaporated. The residue is extracted with hot 99 % ethanol. Adding ether (500 ml) affords sodium /w-hydroxybenzenesulfonate (23.55 g), which has m.p. 314° after recrystallization from ethanol. 

Dibutyl disulfide 279 w-Butyl bromide (38.1 g) and sodium thiosulfate (74.4 g) are dissolved by warming in 50% ethanol (450 ml), then iodine is added in small portions until its color remains permanently. The aqueous layer is separated and extracted with ether the residue obtained on evaporation of the extract is united with the previous oily layer, washed with sodium hydrogen sulfite solution, dried over sodium sulfate, and distilled in a vacuum, giving the disulfide (57 %), b.p. 90-100°/3 mm. 

Oxidation by potassium permanganate is usually carried out in acetic or sulfuric acid solution. Isolation of the sulfone must include separation from the precipitate of manganese(iv) oxide hydrate, which, in the case of sparingly soluble sulfones, is effected by reduction of this precipitate by just sufficient sodium hydrogen sulfite solution or by sulfur dioxide soluble sulfones can be isolated by addition of water after filtration from the hydrated manganese oxide or by acidification and extraction with ether. 

Acetone (1 mole) is shaken with a concentrated aqueous solution of sodium hydrogen sulfite (1 mole). The mixture becomes warm and is allowed to cool, then a concentrated aqueous solution of potassium cyanide (1 mole) is dropped in with good shaking, whereupon the solution again becomes warm. The mixture is cooled again and the oily layer of acetone cyanohydrin is separated from the aqueous layer, which is then extracted several times with ether. The cyanohydrin layer and ether extracts are united, washed with sodium hydrogen sulfite solution to remove acetone, and then with saturated sodium chloride solution, and freed from ether. Completely alkali-free acetone cyanohydrin boils at 82°/23 mm and melts at-19°. 

The brown solid is collected on a suction filter and washed successively with 15 ml. of 95% ethanol, two 15-ml. portions of 5% aqueous sodium hydrogen sulfite solution, 20 ml. of water, and two 20-ml. portions of hot 95% ethanol. Although the ethanol washings are green, little product is lost in this step. 

Clean and dry the graduated cylinder, and then use it to measure 5.0 ml 0.01 AT sodium hydrogen sulfite solution (NaHS03). Slowly add this solution to the beaker while stirring with a stirring rod. 

Nevile-Winther acid can also be obtained by a reversed Bucherer reaction from l-aminonaphthalene-4-sulfonic acid with aqueous sodium hydrogen sulfite solution and SO2 at 95 °C and a pressure of 2.5 bar. 

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