3-Aminobenzenesulfonate

Dipping solution 1 Dissolve 500 mg 4-aminobenzenesulfonic acid and 150 mg 8-hydroxyquinoline in 100 ml of a mixture of acetone -diethyl ether — water (12 + 12 + 1). This solution is stable for several months. It should be topped up with diethyl ether from time to time to make up for evaporation losses. 

Nitrates and nitrites are first reduced to nitrosyl chloride with thionyl chloride. The volatile nitrosyl chloride then reacts with 4-aminobenzenesulfonic acid to yield a diazonium salt that then couples with 8-hydroxyquinoline to form a colored azo compound. Hence, the coupling reagent is applied to the chromatogram first. 

Sulfite may not necessarily be eliminated before ring fission. The degradation of 4-aminobenzenesulfonate by a mixed culture of Plydrogenophaga palleroni mA Agrobacterium radiobacter produced 4-sulfocatechol from which the sulfonate was eliminated... 

Principally the same, but chemically simpler, sequence was used to prepare arylnitro anion-radicals from arylamines, in high yields. For instance, aqueous sodium nitrite solution was added to a mixture of ascorbic acid and sodium 3,5-dibromo-4-aminobenzenesulfonate in water. After addition of aqueous sodium hydroxide solution, the cation-radical of sodium 3,5-dibromo-4-nitro-benzenesulfonate was formed in the solution. The latter was completely characterized by its ESR spectrum. Double functions of the nitrite and ascorbic acid in the reaction should be underlined. Nitrite takes part in diazotization of the starting amine and trapping of the phenyl a-radical formed after one-electron reduction of the intermediary diazo compound. Ascorbic acid produces acidity to the reaction solution (needed for diazotization) and plays the role of a reductant when the medium becomes alkaline. The method described was proposed for ESR analytical determination of nitrite ions in water solutions (Lagercrantz 1998). 

A reactor charged with 4,4 -diphenylether-dicarboxylic acid, hydrazinesulfate, and polyphosphoric acid were mixed and reacted for 1 hour at 160°C and then further heated to 180°C. This mixture was then treated with 4-aminobenzenesulfonic acid and heated for an additional 2 hours. The molar solubility ratio of polyphosphoric acid/hydrazinesulfate and the molar monomer ratio ofhydrazinesulfatc/4,4 -dipheny-lether-dicarboxylic acid were kept constant at 10 and 1.2, respectively. The mixture was further treated with sufficient 4-aminobenzenesulfonic acid so that the molar ratio of in situ formed polyhydrazide was maintained at 1 1. After heating was stopped, the mixture was poured into warm water containing 5 wt% sodium hydroxide solution and a dark blue fiber obtained. The fiber was washed in distilled water and then dried in a vacuum furnace for 48 hours at 100°C. The dried material had a nitrogen/carbon ratio of 0.174 and a sulfur/carbon ratio of 0.058. The product had an Mw of... 

Which of the following acids would be most suitable for preparing a buffer of pH 3.10 (i) hydrogen peroxide (ii) propanoic acid (iii) cyanoacetic acid (iv) 4-aminobenzenesulfonic acid ... 

Monoazo Yellow Salts. Several monoazo yellow salts have gained popularity since the 200°C temperature restriction on the use of diarylide yellows has been imposed. One is Pigment Yellow 168 [71832-85-4], the calcium salt of diazotized 3-nitro-4-aminobenzenesulfonic acid coupled with acetoaceto-2-chloroanilide. It provides a clean, somewhat greenish yellow color which shows good migration resistance but relatively poor tinctorial strength. It is used in polyethylene and inexpensive industrial finishes where the durability requirements are not high. 

Aminobenzenesulfonic Acid, Sodium Salt Not more than 0.2%. 

Diphenyltriazene Not more than 40 xg/kg. l-(Phenylazo)-2-naphthalenol Not more than 10 mg/kg. Sodium Salt of 4-Aminobenzenesulfonic Acid Not more than 0.2%. 

Aminobenzenesulfonic acid <0.2% as the sodium salt 6-Hydroxy-2-naphthalenesulfonic acid <0.3% as the sodium salt... 

Aminobenzenesulfonic acid <0.2% as the sodium salt 4,5-Dihydro-5-oxo-l-(4-sulfophenyl)-lH-pyrazole-3-car-boxylic acid <0.2% as the disodium salt Ethyl or methyl 4,5-dihydro-5-oxo-l-(4-sulfophenyl)-lH-pyrazole-3-carhoxylate <0.1% as the sodium salt 4,4 -(l-Triazene-l,3-diyl)bis[benzenesulfonic acid] ... 

AMINOBENZENESULFONIC ACID or p-AMINOBENZENESULFONIC ACID (121-57-3) CsH NOjS HjO Decomposes on contact with strong acids, forming sulfur trioxide. The aqueous solution is acidic reaction with strong bases. Incompatible with alkylene oxides, aliphatic amines, alkanolamines, amides, ammonia, epichlorohydrin, organic anhydrides, isocyanates, oxidizers, vinyl acetate. On small fires, use dry chemical powder (such as Purple-K-Powder), Halon , water spray, or CO2 extinguishers. 

Aminobenzenemethanamine 2-Aminobenzenemethanol 4-Aminobenzenesulfonamide 2-Aminobenzenesulfonic acid 3-Aminobenzenesulfonic acid 4-Aminobenzenesulfonic acid 4-Aminobenzenesulfonyl fluoride... 

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