Sodium stannite

A sodium stannite solution was prepared by addition of aqueous sodium hydroxide (2.5 mol, lOOg) to aqueous stannous chloride (0.25 mol, 56g). The initially formed precipitate redissolved to form a clear solution. This solution was gradually added to a solution of 16.3g (0.1 mol) phenyl-2-nitropropene in THF at room temperature. A slightly exothermic reaction ensued, and the reaction mixture was stirred for 30 min, a saturated sodium chloride solution was added, and the solution was extracted with ether and the pooled extracts were evaporated under vacuum to give essentially pure P2P oxime in 80% yield. 

Toluene from Toluidine.—It is often desirable to obtain tbe hydiocarbon from the base. The process of diazotisntion offers the only convenient method. The diazonium salt may be reduced by alcohol (Reaction 1, p. 162) or, as in the piesent instance, by sodium stannite. Less direct methods are the con-veision of the diazonium compound into (i) the hydrazine (see p. 174), (2) the acid and distillation with lime (p. 200), (3) the halogen derivative and reduction with sodium amalgam, 01, finally (4) the phenol and distillation with zinc dust. 

Zinnozydul, n. stannous oxide, tin(II) oxide, -chlorid, n. stannous chloride, tin(II) chloride. -hydrat, n. stannous hydroxide, tin(II) hydroxide, -natron, n. sodium stannite. -reserve, /. stannous oxide resist, -salz, n. stannous salt, tin(II) salt, -verbindimg, /. stannous compound, tin(II) compound. 

Phenylhydrazine has been prepared by the reduction of benzene diazonium salts with sulfites 1 by the reduction of benzene diazonium chloride with stannous chloride 2 by the reduction of benzene diazonium hydrate with zinc or sulfur dioxide 3 by the reduction of sodium benzene diazotate with sodium stannite 4 by the reduction of diazoamino benzene 5 by the reduction of nitrosophenyl hydroxylamine or its methyl ether 6 and by the action of hydrazine hydrate on phenol.7... 

Sodium stannite is one of the reagents suitable for replacement of a diazon-ium group in aromatic compounds by hydrogen [219]. 

Sodium stannite (which is not a developer) reacts very rapidly with silver nitrate or with the silver sulfite complex, and the rates have not... 

Sodium Stannite. Add an excess of sodium hydroxide solution in small portions to a tin(II) chloride solution. Comment on your observations. 

Precipitate bismuth hydroxide, and introduce it into a sodium stannite solution. What happens Write the equations of the reactions. What properties of tin(II) compounds are indicated by this reaction ... 

Prepare a sodium stannite solution, dilute it with water, and let it stand to your next lesson. What happens How can sodium stannite be prepared in an aqueous solution and by a dry technique Is the composition of the sodium stannite obtained in both cases the same Write the equations of the reactions. 

Sodium hypnnitrite Na N 0 is formed (I) by reaction of sodium nitrate or nitrite solution with sodium amalgam (sodium dissolved in incrcuryl, alter which acetic acid is added to neutralize the alkali. Sodium stannite ferrous hydroxide, or electrolytic reduction w ith mercury cathode may also be utilized. (2) by reaclion of hydroxylamine sulfonic acid and sodium hydroxide. Silver hyponitrite is formed by reaclion of silver nitrate solution and sodium hyponitrite. 

Tin forms two series of compounds tin(II) or stannous compounds and tint IV1 or stannic compounds. Tin(ll) oxide, SnO, insoluble in water, is formed by precipitation of an SnO hydrate from an S11CL solution with alkali and later treatment in water (near the boiling point and at constant pH). It is amphiprotic, but only slightly acid, forming stannites slowly with strong alkalis. Sodium stannite is conveniently prepared from... 

This reaction can be employed to remove a primary amino group from an aromatic compound, especially. when the ordinary method of direct reduction of the diazonium compound by sodium stannite or alcohol is not applicable. Although in the application of this method the hydrazine can be prepared as the hydrochloride, and reduced in the same solution, yet it is better to isolate the free base and oxidise it separately, since in the oxidation of the hydrochloride there is a tendency for the hydrazine radical to be replaced by chlorine. 

Few sodium stannite deaminations are to be found in the literature, and of these a substantial fraction concerns unsubstituted amines and their homologs. Thus, benzene is obtained from aniline in 60% yield,102 18 and the hydrocarbons derived from 2,3-dimethylaniline and 2,4,5-trimethylaniline are produced in satisfactory yields and in a high state of purity.108... 

In the following instances, failures have been recorded for sodium stannite 3-nitro-4-aminotoluene,106 p-aminophenylarsonie add,92 trans-o-aminocinnamic acid.98 ... 

A number of by-products may be isolated from sodium stannite reductions. In addition to benzene, aniline gives phenol, azobenzene, phenyl azide, and phenylhydrazine.107 10 108 109 The danger of hydrolytic cleavage in alkaline media, previously discussed in connection with the... 

H O 0lNO>, H O C=C Either ethanol or amyl alcohol may be used. Sodium stannite gives a 38% yield (pure). Amyl alcohol and Cu powder are the preferred reagents. 159, 160... 

Dijuninotriptycene (p. 280) Triptycene (40-45%, pure) Must diazotize with sulfuric acid. Ethanol and sodium stannite fail here. 83, see p. 297... 

Pure tin was also used for the direct synthesis of organotin compounds. In 1948, unlike previous investigations, Harada obtained sodium stannite Na2Sn not by the metal fusion, but by the reaction of tin with sodium in liquid ammonia628. The reaction of Na2Sn with EtBr led to (Et2Sn)n. 

Sodium stannite and sodium plumbite both hydrolyze easily but the latter much more so, consequently the greater amount of base to overcome its tendency to hydrolyze. 

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