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Bazanova I. N. Kholodkova N. V. Gostikin V. P. 《Russian Journal of Applied Chemistry》2002,75(3):436-440
Reduction of 4,4'-dinitrostilbene-2,2'-disulfonic acid with hydrogen in aqueous solution on Raney nickel yields a trisazo compound identical to Direct Yellow K dye. 相似文献
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O. V. Lefedova M. P. Nemtseva M. A. Zuenko V. P. Gostikin 《Kinetics and Catalysis》2006,47(5):715-718
The homogeneous reactions of nitrohydrazo derivatives contribute substantially to the benzotriazole selectivity of the hydrogenation of substituted 2-hydroxynitroazobenzene. The rate of the homogeneous steps is governed by the solvent composition rather than by the substituent in the starting nitroazobenzene. An increase in pH in both aqueous and aqueous-alcohol solutions increases the rate constants of the homogeneous reactions of various substituted nitrohydrazo derivatives and considerably enhances the selectivity of the reaction with respect to the compounds containing a triazole ring. A kinetic model has been suggested to qualitatively describe the influence of the pH value of the medium on the rate of the cyclization of substituted 2′-hydroxy-5′-hydrazobenzenes into the corresponding benzotriazole N-oxides. 相似文献
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