Hydrogen sulfites

The reaction of the hydrogen sulfite ion in an alkaline solution with ketones and aldehydes is ... [Pg.1169]

The carbon-oxygen double bond of the carbonyl group is opened, and the hydrogen sulfite radical is added. An increase in temperature reverses the reaction more easily for ketones than for aldehydes. [Pg.1169]

Sodium or potassium hydrogen sulfite reacts with several thiiranes to give disulfides of /3-mercaptosulfonic acid salts (76EGP122086). Potassium thiocyanate in dimethylformamide or aqueous ethanol isomerizes thiiranes (Scheme 84) (72CJC3930). 1,2-Dithiols are obtained by treatment of thiiranes with NaBH2S3 obtained from sodium borohydride and sulfur (73TL1401). [Pg.161]

Under acidic conditions, perfluoroalkyl iodides (but not bromides) react with sodium hydrogen sulfite and cerium(IV) ions to form the corresponding sulfinates [76] (equation 69). [Pg.463]

Consistent with this, experiments using HS" labelled with radioactive (p. 661) show that acid hydrolysis of the 8203 produces elemental sulfur in which two-thirds of the activity is concentrated. Thiosulfates can also he made by boiling aqueous solutions of metal sulfites (or hydrogen sulfites) with elemental sulfur according to the stoichiometry... [Pg.714]

Only with large cations such as Rb, Cs and NRafR = Et, Bu", n-pentyl) has it proved possible to isolate the. solid sulfites The sulfite ion SOs is pyramidal with Cj,. symmetry angle O-S-O 106°, S-O 151 pm. The hydrogen sulfite ion also appears to have C3, symmetry both in the solid state and in solution, i.e. protonation occurs at S rather than... [Pg.719]

On a technical scale,. solutions of sodium hydrogen sulfite are prepared by passing SO2... [Pg.719]

Like sulfurous acid , disulfurous acid is unknown either in the free state or in solution. However, as indicated in the preceding section, its salts, are readily obtained from concentrated solutions of hydrogen sulfite 2HS03 S2O52- + H2O. Unlike disulfates... [Pg.720]

Acidification of solutions of disulfites regenerates HSO3 and SO2 again, and the solution chemistry of S205 is essentially that of the normal sulfites and hydrogen sulfites, despite the formal presence of S and S (rather than S ) in the solid state. [Pg.720]

SO2. Consistent with this, air-oxidation of alkaline dithionite solutions at 30-60° are of order one-half with respect to [8204 ]. Acid hydrolysis (second order with respect to [8204 ]) yields thiosulfate and hydrogen sulfite, whereas alkaline hydrolysis produces sulfite and sulfide ... [Pg.721]

Salts of nitridotrisulfuric acid, N(S03M )3, are readily obtained by the exothermic reaction of nitrites with sulfites or hydrogen sulfites in hot aqueous solution ... [Pg.743]

This ion, HSOT. is also called hydrogen sulfite. [Pg.215]

Sodium, acid sulfite or sodium hydrogen sulfite (NaHS03) has a MW of 104 and a sp. gr. of 1.48. It is a white, corrosive crystalline powder that is very soluble in hot or cold water. It is approved in the United States under 21CFR 173.310, GRAS. It is typically available as a 40% w/w... [Pg.487]

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