Use of N-chloro-N-methyl-p-toluenesulfonamide in N-chlorination reactions
摘要:
Second-order rate constants (k2) were determined for the addition of ten nitrogenous organic compounds (benzylamine, 2,2,2-trifluoethylamine chlorhidrate, methylamine chlorhidrate, glycine ethyl ester chlorhidrate, glycine, glycylglycine chlorhidrate, morpholine, pyperidine, pyperazine and dimethylamine) to the N-chloro-N-methyl-p-toluenesulfonamide (NCNMPT) in the formation reaction of N-chloramines in aqueous solution at 25 degrees C and ionic strength 0.5M. The series of nucleophiles considered is structurally very varied and covers five pKa units. The kinetic behaviour is similar for all compounds, being the elementary step the transfer of chlorine from the NCNMPT molecule to the nitrogen of the free amino group. These reactions were found first order in both reagents. The values of the rate constants indicate that the more basic amines produce N-chloramines more readily. Rate constants for the nucleophilic attack are shown to correlate with literature data for some of these nitrogenous organic compounds in their reaction with N-methyl-N-nitroso-p-toluenesulfonamide. Both reactions involve that the rate determining step is the attack of nitrogenous compounds upon electrophilic centre (Cl or else NO group). NCNMPT is a particularly interesting substrate, for which has not hitherto been published kinetic information, that allows us to assess the efficiency and the competitiveness of this reaction and compare it with other agents with a Cl+ atom. Copyright (c) 2013 John Wiley & Sons, Ltd.
Practical and regioselective amination of arenes using alkyl amines
作者:Alessandro Ruffoni、Fabio Juliá、Thomas D. Svejstrup、Alastair J. McMillan、James J. Douglas、Daniele Leonori
DOI:10.1038/s41557-019-0254-5
日期:2019.5
these molecules are assembled through the stepwise introduction of a reactivity handle in place of an aromatic C-H bond (that is, a nitro group, halogen or boronic acid) and a subsequent functionalization or cross-coupling. Here we show that aromaticamines can be constructed by direct reaction of arenes and alkyl amines using photocatalysis, without the need for pre-functionalization. The process
Vacuum Gas/Solid<i>N</i>-Chlorination: Preparative Scale Synthesis of Volatile<i>N</i>-Chloramines
作者:J. C. Guillemin、J. M. Denis
DOI:10.1055/s-1985-31450
日期:——
A simple method for the preparative scale synthesis of volatile chloramines free from impurities starting from the corresponding primary or secondary amine using N-chlorosuccinimide as chlorinating agent is described.
Kinetics and mechanism of N-chloromethylamine decomposition in solutions
作者:V. V. Kuznetsov、M. D. Vedenyapina、M. I. Pleshchev、S. B. Gashev、N. N. Makhova、A. A. Vedenyapin
DOI:10.1134/s0036024416030225
日期:2016.3
Kinetics of N-chloromethylamine decomposition in an aqueous base medium and chloroform at different temperatures is studied. The decomposition of N-chloromethylamine is found to obey a second order equation in an aqueous base medium at an equimolar ratio of the reagents and a first order equation in chloroform with excess base. The activation energy of N-chloromethylamine decomposition in the both