5039-61-2Relevant articles and documents
Novel route to N-alkyl- and N,N′-dialkylhydrazines by high-pressure alkylation of azines
Agafonov,Dudin,Preobrazhenskii
, p. 714 - 716 (2007/10/03)
Reactions of alkyl halides with azines of p-nitrobenzaldehyde, benzaldehyde, and p-methoxybenzaldehyde at a high pressure (10 kbar) were studied. Hydrolysis of the reaction mixtures gives pure N-monoalkyl- or N,N′-dialkylhydrazines in high yields, depending on the structure of the starting azine and the solvent nature. It was found that non-symmetrical N,N′-dialkylhydrazines can be synthesized without isolating intermediate N-monoquaternary immonium salts. The effect of the phase transition of the solvent on the direction of the alkylation is discussed.
Oxidation of aliphatic amides by N-chlorobenzenesulfonamide in acid medium catalyzed by ruthenium(III): A kinetic and mechanistic study
Puttaswamy,Jagadeesha,Ramalingaiah, Hulivana
, p. 426 - 432 (2007/10/03)
The kinetics of the ruthenium(III)-catalyzed oxidation of urea and substituted ureas, namely, methylurea, ethylurea and propylurea by sodium N-chlorobenzenesulfonamide or chloramine-B (CAB) in HCI medium have been studied at 30°. The reaction rate shows a first order dependence each on [CAB], [amide] and [RuIII] and fractional order on [H+]. Additions of halide ions and the reaction product of CAB (benzenesulfonamide) and the variation of ionic strength and dielectric constant of the medium do not have any significant effect on the reaction rate. Activation parameters have been evaluated. The rate increases in D2O medium. Proton inventory studies were made in H2O-D2O mixtures for both the amides. A Taft linear free energy relationship is observed for the reaction with ρ* = -0.88 and -3.20 and δ = -0.33, indicating that electron-donating groups enhance the rate. An isokinetic relation is observed with β = 372 K confirmed by the Exner criterion. The protonation constant of monochloramine-B has been evaluated to be 8.6. A mechanism consistent with the observed kinetic data has been proposed. The rate of oxidation increases in the order: propylurea > ethylurea > methylurea > urea.