2.5- Diaminobenzenesulfonic acid

Similarly, dyes 40 and 41 are prepared by condensing 2,5-diaminobenzenesulfonic acid with bromamine acid, which reacts first at the less hindered amino group, followed by a reaction with cyanuric chloride to introduce the reactive group. These steps produce dye 41 and... 

C6H7N302 6-amino-3-nitro-2-picoline 22280-62-2 351.15 29.788 2 7365 C6H8N203S 2,5-diaminobenzenesulfonic acid 88-45-9 773.15 70.660 1,2... 

Yet other recent examples of studies of copolymerizations have included that of aniline with m-phenylene diamine (MPDA) [378], where copolymerization was found to occur only at low MPDA concentrations. Yang and Wen [379] studied the electrochemical copolymerization of aniline with 2,5>diaminobenzenesulfonic acid (DABSA) in aqueous HCl solutions. The copolymer films obtained were electroactive, but did not exhibit significant conductivity (< 0.2 S/cm) nor electro-chromism. 

C6H7N302 6-amino-5-nitro-2-picoline 21901-29-1 351.15 29.788 2 7364 C6H8N203S 2,4-diaminobenzenesulfonic acid 88-63-1 773.15 70.660 2... 

Zn-dust added portionwise to a soln. of Na-2,l,3-.benzoselenadiazole-4-sulfonate in aq. HCl, and heated 1 hr. on a steam bath 2,3-diaminobenzenesulfonic acid. Y 79%.—Substitution and subsequent reduction of 2,1,3-benzoselenadiazoles produces otherwise difficultly accessible o-phenylenediamines. F. e., reduction with SnClg/HCl, s. C. W. Bird, G. W. H. Cheeseman, and A. A. Sarsfield, Soc. 1963, 4767. 

Methods have been developed to improve solubility and processability by introducing various alkyl, alkoxy, aryl, sulfonyl, and amino groups onto the PANI backbone (189). However, the presence of these substituents dramatically reduces yields of polymer, polymer molecular weight, and conductivity. Novel water-soluble PANI has been recently synthesized using horseradish peroxidase catalyzed by oxidative free-radical coupling of 2,5-diaminobenzenesulfonate (190). Unlike standard PANI preparations, the resultant polymer is fully sulfonated upon treatment with fuming sulfuric acid, and it shows strong pH dependance of absorption and other physical properties. 

---