98-44-2Relevant articles and documents
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.
High temperature process for preparing fiber reactive dyes
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, (2008/06/13)
A process for preparing monoazo dyes by coupling a aromatic diazonium salt with an amino-4-hydroxy-naphthalene sulfonic acid derivative at a temperature of 40°-85° C. The process of the invention provides a isomerically purer dye.
2,4-diamino-6-fluorotriazine disazo reactive dyestuffs
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, (2008/06/13)
A dyestuff of the formula STR1 in which R is H or Ch3 STR2 in which R1 is H, substituted or unsubstituted C1 -C4 -alkyl or --X--Y X is a divalent aliphatic, cycloaliphatic, aliphaticcycloaliphatic radical or an araliphatic radical Y is COOH, SO3 H, OSO3 H or SO2 G, in which G is CH=CH2 or --CH2 --CH2 --Z, in which Z denotes a group which can be eliminated under alkaline conditions, R2 is H or C1 -C4 -alkyl, and the benzene radical D and the benzene or naphthalene radical L can contain customary substituents, is suitable for the dyeing and printing of OH- and NH-containing materials. They produce lightfast and wetfast brilliant dyeings and prints.