19349-01-0Relevant articles and documents
SOME KINETIC ASPECTS OF THE ALCOHOLYSIS OF N,N'-DIARYLSULPHURDIIMIDES
Carpanelli, Corrado,Gaiani, Giovanni
, p. 503 - 506 (2007/10/02)
Kinetic determinations (at 22 deg C) show that the ethanolysis of N,N'-diarylsulphurdiimides 1 - 9, catalysed by anhydrous copper(II) chloride, obeys a first-order rate law with respect to N,N'-diarylsulphurdiimide.The logarithm of the observed first-order rate constants (at the same concentration of the catalyst) can be correlated with the Hammett ? substituent constants.The ethanolysis rate of 1 - 9 is increased by the electron-withdrawing effect of the substituents linked to the aromatic rings of N,N'-diarylsulphurdiimide.The observed first-order rate constant of the CuCl2-catalysed ethanolysis of N,N'-bis(p-tolyl)sulphurdiimide, 3, is directly proportional to the catalyst concentration: kobs = k2.The second-order rate constants, k2, of the alcoholysis of 3 were measured in four alcohols different from ethanol.These constants seem to be a function of the polarity of the reaction medium and of the steric hindrance of the alcohol.Finally, it was ascertained that the catalysing power of CuCl2 in the ethanolysis of 3 is higher than that of NiCl2 and CoCl2.