Ammonium sulfide group

Silica gel G Acetone/conc. HCI/2,5-hexanedione 100 1 0.5 Ammonium sulfide group... 

If aluminum is to be detected in the presence of other members of the ammonium sulfide group, it is necessary to dissolve away the morin compounds of these elements by several more drops of dilute hydrochloric acid. Besides aluminum, only the zirconium compound resists this treatment. 

T est for aluminum in the presence of other metals of the ammonium sulfide group... 

Almost all the elements of the ammonium sulfide group give colored lakes with polyhydroxyanthraquinones and interfere with the direct test for indium. In a few cases the test may be carried out nevertheless. In the presence of aluminum, the interfering ion may be masked by formation of the complex [AlFg]- ion. A drop of the test solution is mixed with 3 or 4 drops of a saturated solution of sodium fluoride in a micro crucible. The test, as described, is then carried out using a drop of this mixture. 

This group is called the ammonium sulfide group. The sulfide of aluminum(III) and chromium(III) are unstable, reacting with water to form the hydroxides. 

These copolymers undergo side reactions which are mainly reducible to reactions in which chloride atoms take part. When copolymers of AN and vinylidene chloride are treated with aqueous solutions of ammonium sulfide at 90 °C, nitrile groups have been shown to be almost fully converted into thioamide groups, and practically no hydrolysis of the formed thioamide groups is taking place in this case. At the same time, it was found that in the course of this treatment dehydrochlorination is taking place almost quantitatively ... 

Nitro group in an oxime is reduced preferentially to the oximino group with ammonium sulfide [240]. In a monoxime of a diketone, the oximino group is reduced to amino group to the exclusion of the carbonyl group by catalytic hydrogenation over platinum oxide in methanolic hydrochloric acid 9-keto-10-oximino-1,2,3,4-tetrahydrophenanthraquinone afforded 10-amino-9-keto-l,2,3,4-tetrahydrophenanthrene in 78% yield [949]. 

In carboxylic adds containing nitro groups borane reduced only the carboxyl group [738, 977] whereas ammonium sulfide reduced only the nitro group [239]. 

Aminobenzo[6]thiophene is prepared from 7-hydroxybenzo[6]-thiophene by means of the Bucherer reaction it may be converted into 7-nitrobenzo[6]thiophene via the diazonium salt.84 5,7-Diamino-3-phenylbenzo[6]thiophene and its 2-carboxylic acid are prepared by reduction of the corresponding dinitro compound.334 Partial reduction of o,7-dinitro-3-phenylbenzo[6]thiophene-2-carboxylic acid with ethanolic ammonium sulfide affords 7-amino-5-nitro-3-phenylbenzo-[6]thiophene-2-carboxylic acid, the amino group of which may be replaced by hydrogen or iodine via the diazonium salt.334 7-Amino-4-methoxybenzo[6]thiophene is mentioned in the patent literature.560... 

A reaction of 4-nitro-l,2-phenylendiamine with benzotrichloride in the presence of sodium methylate [367] has been described. In this case 2-phenyl-5(6)-nitroben-zimidazole is obtained without preliminary extraction of the ortho-ester of benzoic acid. Sometimes acylated polynitroanilines, with one of the groups in the orthoposition to the amino group, are used as the initial products. On partial reduction of such compounds the cyclization to benzimidazoles takes place [85, 368], For example, the reduction of 2,4-dinitroacetanilyde with ammonium sulfide has afforded 2-methyl-5(6)-nitrobenzimidazole (Scheme 2.41) [85],... 

H). The use of sodium borohydride in the presence of platinum, palladium or Raney nickel [96] has been shown to give greater than 50% yields of benzimidazole )V-oxides, but even this reagent is capable of reducing a nitro group to amino, and combined with product loss on work-up, yields of the Af-oxides are often disappointing [97]. Sulfide reduction procedures (c.g. ammonium sulfide) seem better for 1-substituted benzimidazole 3-oxides than for benzimidazole 1-oxides [88, 92]. 

Traube purine synthesis. Preparation of an appropriate 4,5-diaminopyrimidine by introduction of the amino group into the 5 position of 4-amino-6-hydroxy- or 4,6-diaminopyrimidines by nitrosation and ammonium sulfide reduction, followed by ring closure with formic acid or chlorocarbonic ester. 

Proposed reaction mechanism of l-hydroxy-2-propanone or l-hydroxy-2-butanone with ammonium sulfide is shown in Figure 5. 2-Iminoalcohols, which were derived from the reaction of ammonia and a-hydroxyketones, were condensed with another molecule of a-hydroxyketone to form 2-(l-hydroxymethyl)-2,4-dialkyl-3-oxazolines. The substitution of -OH group with -SH group resulted in the formation of 2-(l-hydroxyemthyl)-2,4-dialkyl-3-thiazolines. No 2-(l-mercaptomethyl)-substituted isomers were found in either reaction. Upon heating, these intermediates were further converted to the corresponding oxazolines, oxazoles, thiazolines and thiazoles. 

Detection. — Uranium is precipitated in the Third Group and in the analysis undergoes numerous characteristic changes. (1) When present as a uranyl salt the addition of ammonia produces a precipitate of ammonium dim-anate, (NHOjUjOj, which appears as a yellow powder which is slowly transformed by ammonium sulfide to UO2S, dark brown, soluble both in HC1 and (NH<) 2C03. (2) When NaOH is added to a solution of a uranyl... 

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