Amino-sulphonic acids

Lassaigne s test is obviously a test also for carbon in the presence of nitrogen. It can be used therefore to detect nitrogen in carbon-free inorganic compounds, e.g., complex nitrites, amino-sulphonic acid derivatives, etc., but such compounds must before fusion with sodium be mixed with some non-volatile nitrogen-free organic compound such as starch... 

Supplement 1951 1872-1928 Hydroxy-carbonyl amines, 233. Amino-carboxylic acids Anthranilic acid (o-aminobenzoicacid). 310. Amino-hydroxy-carboxylic acids, 577. Amino-sulphonic acids Sulphanilio acid, 695. 

Thionyl chloride reacts with ammonia giving rise to various complex products, the nature of which varies with the conditions.4 With amino-sulphonic acid at 100° C. ammonium chlorosulphonate is formed.5... 

This extensive research, the work of many years, was published in four large instalments from 1910 to 1919 [all under her name alone]. Five of the six theoretically possible diio-dosulphonic acids, three of the six theoretically possible triio-dosulphonic acids, and one tetraiodosulphonic acid, were first prepared by her, and incidentally she prepared a large number of new nitro- and amino-sulphonic acids. The orientation of these substances was worked out, their important derivatives were accurately characterised, and the electrolytic behaviour of the more important members was investigated. 

Sulphonic acids are also the products formed on reaction of carbonyl compounds with hydrogen sulphite (bisulphite addition compounds)182,183. a-Amino sulphonic acids are produced, albeit in low yield, upon reaction of hydrogen sulphite ions with aldehydes, in the presence of ammonia184. 

Amino sulphonic acids are produced in good yields by reaction of cyclic sulphonate esters with ammonia316, as exempliied in equation 66. 

In contradiction to other reports claiming a cycloaddition mechanism, a sulphinylamine gives an cf-amino-sulphonic acid R NHCHR S03H with aldehydes through successive hydrolysis and then condensation and bisulphite-addition reactions. ... 

Ammonium salts of sulphonic acids 98. Sulphonic adds, sulphonamides 98. Amino-sulphonic acids 100. Sulphates of bases 101. Thioureas and thioamides 101. Sulphonyl halides 102. JV-Halosulphonamides 103. Aldehyde and ketone bisulphite compounds 103. Thiols 103. Thioethers 104. Thio-acids 104. Esters of sulphonic adds lOS. 

VIII. Compounds containing sulphur (with or without nitrogen and/or halogen). Ammonium salts of simple and substituted sulphonic acids. Sulphonic acids and their metallic salts sxdphonamides. Amino-sulphonic acids. Siilphates of bases. Thiourea, substituted thioureas, thioamides. Sulphonyl halides. iV-Halogeno-sulphonamides. Aldehyde and ketone bisulphite compounds. Thiols. Thio-ethers. Thio-adds. Esters of sulphonic adds. 

If nitrogen is found to be present, the parent acid probably contains an amino- (see amino-sulphonic acids, page 100) or a nitro-group. The latter may be detected in the original compound by applying the tests on page 88. 

Snlj namide (not suitable for hydroxy- or amino-sulphonic acids)... 

Anthraquinone is of great technical importance, as many of its derivatives form valuable dyes notable among these are the hydroxy-derivatives (alizarin, etc.)y the amino-derivatives (indanthrene, etc.) and the sulphonic acids. 

C) Amino-aromatic sulphonic acids. Sulphanilic acid. 

C) AMINO AROMATIC SULPHONIC ACIDS. Sulphanilic or p-amino-benzene sulphonic acid, NH2CJH4SO3H. 

These salts are by far the most readily prepared derivatives (having sharp m.ps.) of the amino-aromatic sulphonic acids. 

Amino Aromatic Sulphonic Acids. Benzylthiouronium salts (p. 384). 

Amino aromatic sulphonic acid (sulphanilic acid)... 

The procedure is not usually applicable to aminosulphonic acids owing to the interaction between the amino group and the phosphorus pentachloride. If, however, the chlorosulphonic acid is prepared by diazotisation and treatment with a solution of cuprous chloride in hydrochloric acid, the crystalline chlorosulphonamide and chlorosulphonanilide may be obtained in the usual way. With some compounds, the amino group may be protected by acetylation. Sulphonic acids derived from a phenol or naphthol cannot be converted into the sulphonyl chlorides by the phosphorus pentachloride method. 

The presence of certain substituents e.g., the amino group) may markedly affect the solubibty and other properties of the sulphonic acid or carboxylic acid. Thus such sulphonic acids as the aminobenzenesul-phonic acids, pyridine- and quinoline-sulphonic acids exist in the form of inner salts or zwitter-ions that result from the interaction of the basic amino group and the acidic sulphonic acid. Sulphanilic acid, for example, is more accurately represented by formula (I) than by formula (II) ... 

Supplement 1953 3242-3457 Hydroxy-carboxylic acids, 190 In i doxylic acid, 226. Carbonyl-carboxylic acids, 284. i Sulphonic acids, 386 Quinoline sul-phonic acid, 390. Amines, 419 2-Aminopyridine, 428. Amino-carboxylic acids, 541 Tryp- tophane, 545. Hydrazines, 563. Azo. compounds, 572. Diazo compounds, 590. ... 

Supplement 1955 3634-3793 Sulphonic acids Indigo-disulphonic acid (indigocarmine), 304. Amines, 308. Keto-ammes Pyramidone, 452. Allan-toin, 474. Murexide, 499. Amino-carboxylic acids Histidine, 513. j Hydrazines, 531. Azo compounds, 535. 1... 

Phosphorus and Silicon in Waters, Effluents and Sludges [e.g. Phosphorus in Waters, Effluents and Sludges by Spectrophotometry-phosphomolybdenum blue method. Phosphorus in Waters and Acidic Digests by Spectrophotometry-phosphovanadomolybdate method. Ion Chromatographic Methods for the Determination of Phosphorus Compound, Pretreatment Methods for Phosphorus Determinations, Determination of silicon by Spectrophotometric Determination of Molybdate Reactive Silicon-1 -amino-2-naphthol-4, sulphonic acid (ANSA) or Metol reduction methods or ascorbic acid reduction method. Pretreatment Methods to Convert Other Eorms of Silicon to Soluble Molybdate Reactive Silicon, Determination of Phosphorus and Silicon Emission Spectrophotometry], 1992... 

This produces l-methyl-2-amino-4-isopropyl-3 or 5 sulphonic acid. 

Discussion. Small quantities of dissolved silicic acid react with a solution of a molybdate in an acid medium to give an intense yellow coloration, due probably to the complex molybdosilicic acid H4[SiMo12O40]. The latter may be employed as a basis for the colorimetric determination of silicate (absorbance measurements at 400 nm). It is usually better to reduce the complex acid to molybdenum blue (the composition is uncertain) a solution of a mixture of l-amino-2-naphthol-4-sulphonic acid and sodium hydrogensulphite solution is a satisfactory reducing agent. 

Reducing agent. Solution A dissolve 10 g sodium hydrogensulphite in 70 mL water. Solution B dissolve 0.8 g anhydrous sodium hydrogensulphite in 20 mL water, and add 0.16 g l-amino-2-naphthol-4-sulphonic acid. Mix solution A with solution B, and dilute to 100 mL. 

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