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Sodium hyposulfite

Methyl ethyl (7-methoxy-10-methyl-3-phenthiazinyl)malonate (62.2 grams) followed by methyl iodide (45.7 grams) is added to a solution of sodium (4.45 grams) in anhydrous ethanol (500 cc). The reaction mixture is heated under reflux for 1 hour at 45°C, then for 6 hours at 55°C, and finally concentrated to dryness under reduced pressure (20 mm Hg). The residue is taken up in methylene chloride (300 cc) and water (250 cc), filtered in the presence of a filtration adjuvant, washed with methylene chloride (150 cc) and water (150 cc), and decanted. The aqueous solution is extracted once again with methylene chloride (100 cc), and the combined organic solutions washed with water (100 cc), aqueous 0.1 N sodium hyposulfite solution (200 cc) and finally with water (200 cc). After drying over anhydrous sodium sulfate and evaporation to dryness under reduced pressure (20 mm Hg), there is obtained an oil (64.8 grams) which is dissolved in methylene chloride (100 cc) and... [Pg.1322]

Investigations of PAN reduction in DMF solution in the presence of Raney nickel, sodium hyposulfite, acetic acid, pyridine, and water at 40-100 °C have shown52 ... [Pg.116]

At least four companies process spent caustics to market the phenolics and the sodium hyposulfite. However, the market is limited and most of the spent caustics are very dilute, so the cost of shipping the water makes this operation uneconomic. Concentration can be increased by recycling spent caustics at the treater or recycling the spent caustics found in the water bottoms of intermediate product tanks [39]. [Pg.280]

Phthalazinium-1-dates (196) are stable, yellow or colorless crystalline compounds that undergo an interesting variety of reactions. Reduction of aryl derivatives with zinc and dilute hydrochloric acid gives phthalimidines (210) whereas reduction with alkaline sodium hyposulfite gives 3-aryl-3,4-dihydro-l(2A)-phthalazinones (211)." 6.118-120,137 3 Mcthylphthal-... [Pg.38]

Synonyms Antichlor, Hypo, Hyposulfite of soda, Sodium hyposulfite, Sodium subsulfite. Appearance Large, white, transparent crystals and powder. [Pg.195]

Sodium hyposulfite (5-7 percent Na2S204) is also produced on-site at pulp and paper mills by reduction of S02 with sodium boro-hydride solution under alkaline conditions. [Pg.1194]

It is anticipated that such a process would be viable for on-site production of sodium hyposulfite. [Pg.1194]

Dry, clean magnesium turnings (1.22 g, 0.05 mol) are placed in a 250 ml three-necked flask, furnished with an atmosphere of argon, and dry ether (10 ml) is added. A mixture of 5-iodo-2-isopropylpentanonitrile (12.55 g, 0.05 mol) and ether (35 ml) is added dropwise. The reaction is initiated by the addition of a few drops of 1,2-dibromoethane. The mixture is stirred gently at 20-25° for 12-15 h, by which time the metal has reacted. Saturated aqueous ammonium chloride (20 ml) is added. The organic layer is separated and washed with sodium hyposulfite solution. The solvent is evaporated from the ether layer. A solution of oxalic acid (10 g) in water (60 ml) is added to the residue and heated under reflux for 4 h. Extraction with ether and distillation gives 2-isopropylcyclopentanone (4.54 g, 72%). [Pg.105]

As = O, while stronger reducing agents such as hypophosphorous acid (also in the presence of hydriodic acid) or sodium hyposulfite (hydrosulfite) effect reduction to a still lower stage, that of the arseno- compounds... [Pg.93]

When the reduction of a nitrophenylarsonic acid is in question the state of affairs is still more complicated, for it becomes possible to reduce either the mtro- or the arsonic-acid group without affecting the other, or to reduce both simultaneously. For example, ferrous sulfate and alkali give aminophenylarsonic adds, while sulfur dioxide and hydriodic acid together permit the preparation of certain nitrophenylarsmoxides. Sodium hyposulfite (hydrosulfite) in excess, on the other hand, reduces the nitro- to the amino- group, with simultaneous formation of arseno compounds. Ims reagent was used... [Pg.93]

SODIUM o-((3-(HYDROXYMERCURI)-2-METHOXYPROPYL)CARBAMOYL)PHENOXY ACETATE see SIH500 SODIUM HYPOCHLORITE see SHU500 SODIUM HYPOPHOSPHITE see SHVOOO SODIUM HYPOSULFITE see SKIOOO SODIUM INOSINATE see DXE500 SODIUM-5 -INOSINATE see DXE500 SODIUM IODIDE see SHWOOO SODIUM IODINE see SHWOOO SODIUM ISOAMYLETHYL BARBITURATE see AON750... [Pg.1883]

Sodium thiosulfate, NaoS203 5H20 (incorrectly called hypo, from an old name sodium hyposulfite), is a substance used in photography (Chap. 27). It is made by boiling a solution of sodium sulfite with free sulfur ... [Pg.373]

In Paris, when water is chlorinated as at the Ivry plant, it is always dechlorinated with sodium hyposulfite before being pumped to the consumer. The water-borne disease rate since 1930 has under these circumstances been less than 1.6 infections per 100,000 inhabitants, and today the trend is to less than 1 per 100,000. [Pg.417]

Sodium Hypochlorite Sodium Hyposulfite Sodium Iodide Sodium LIgnosulfonate Sodium Metasilicate... [Pg.174]

Sodium Hyposulfite 7785-23-1 Silver Bromide 79-01-6 Ethylene Trichloride... [Pg.1092]


See other pages where Sodium hyposulfite is mentioned: [Pg.74]    [Pg.1512]    [Pg.2203]    [Pg.743]    [Pg.346]    [Pg.350]    [Pg.881]    [Pg.568]    [Pg.121]    [Pg.105]    [Pg.1491]    [Pg.166]    [Pg.561]    [Pg.2899]    [Pg.3281]    [Pg.2203]    [Pg.1193]    [Pg.1193]    [Pg.438]    [Pg.137]    [Pg.138]    [Pg.94]    [Pg.118]    [Pg.210]    [Pg.1050]    [Pg.1080]    [Pg.1092]   
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See also in sourсe #XX -- [ Pg.438 ]

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See also in sourсe #XX -- [ Pg.418 ]




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Hyposulfite

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