13244-33-2Relevant articles and documents
An imine-based colorimetric chemodosimeter for the detection of hypochlorite (ClO -) in aqueous media: its application in test strips and real water samples
Yun, Dongju,Chae, Ju Byeong,Kim, Cheal
, (2019)
Abstract: A highly selective colorimetric chemodosimeter ASAD, (E)-2-((4-(diethylamino)-2-hydroxybenzylidene)amino)-5-methoxybenzenesulfonic acid, was readily synthesized and characterized. The probe ASAD could selectively recognize hypochlorite (ClO -) through an oxidative cleavage of C=N bond with a color change from yellow to colorless and detected it down to a low concentration of 0.95 μ M. Importantly, ASAD could be employed as a practical and efficient optical sensor for ClO - in test strips and water samples. Moreover, the detection process of ASAD to hypochlorite was demonstrated by UV-vis spectroscopy, NMR titration and theoretical calculations. Graphical abstract: A highly selective colorimetric chemodosimeter ASAD was developed to selectively recognize hypochlorite (ClO -) through an oxidative cleavage of C=N bond with color change from yellow to colorless and could detect it down to a low concentration of 0.95 μ M.
Development of an efficient ruthenium catalyzed synthetic process and mechanism for the facile conversion of benzothiazoles to orthanilic acids
Jagadeesh,Karthikeyan,Nithya,Sandhya, Y. Sree,Reddy, S. Sudhaker,Reddy, P. Pradeep Kumar,Kumar, M. Vinod,Charan, K.T. Prabhu,Narender,Bhagat
experimental part, p. 99 - 107 (2010/12/18)
Ruthenium-Schiff base complex catalyzed efficient protocol has been developed for the synthesis of orthanilic acids from benzothiazoles in good to excellent yields using N-haloamines. Hexa-coordinated ruthenium complex with Schiff base and triphenylphosphine ligands has been prepared and its catalytic function was invented for the synthesis of orthanilic acids. The synthetic process utilizes our efficient method for the selective and preferential oxidation of thiazole ring of benzothiazoles using N-haloamines without effecting phenyl ring. The detailed catalytic, mechanistic and kinetic investigations have been made for the synthetic reactions. Solvent isotope studies have been made in H2O-D2O and the reactions were carried out at different temperatures. Under the identical set of conditions, the kinetics of catalyzed reactions has been compared with uncatalyzed reactions and found that the catalyzed reactions are 9-11 folds faster. The catalytic constants (KC) have been calculated for each N-haloamine at different temperatures and the values of activation parameters with respect to the catalyst have been evaluated. Spectroscopic evidence for the formation of 1:1 complex between N-haloamine and ruthenium has been obtained. The observed results have been explained by a plausible mechanism and the related rate law has been deduced.
Preparation, crystal structure and microwave studies on ring-substituted arylammonium hydrogen sulfate salts
Kapoor,Srivastava, Pratibha,Singh, Gurdip,Froehlich, Roland
, p. 1283 - 1288 (2008/09/18)
Three ring substituted arylammonium hydrogen sulfates (RSAHS)/ring substituted dianilinium sulfates (RDAS) have been prepared from corresponding arylamines by treatment with excess conc. H2SO4 and characterized by X-ray crystallography, elemental, gravimetric and spectral analyses. The RSAHS/RDAS salts yield the corresponding ring substituted amino benzene sulfonic acids (RSABSA) when subjected to microwave irradiation. It is observed that these salts undergo transformation to acid in solid state via proton transfer reaction prior to sulfonation.