پديد آورندگان :
Habibi Khorassani S.M نويسنده , Maghsoodlou M.T. نويسنده , Ebrahimi A. نويسنده , Roohi H. نويسنده , Zakarianezhad M. نويسنده
چكيده لاتين :
To determine the kinetic parameters of the reactions between triphenylphosphine and dialkyl acetylenedicarboxylates in the
presence of an NH-acid, such as 2,3-di-hydroxybenzaldehyde, the reactions were monitored by UV spectrophotometry. The
second order fits were automatically drawn and the values of the second order rate constants (k2) were calculated using standard
equations as part of the program. The dependence of the second order rate constant (lnk2) on the reciprocal temperature was in
agreement with the Arrhenius equation, in the temperature range studied, providing the relevant plots to calculate the activation
energy of all reactions. Furthermore, we evaluated the effects of solvent, structure of different alkyl groups within the dialkyl
acetylenedicarboxylates, and their concentration on the rates of reactions. The proposed mechanism was confirmed by
experimental results and steady-state approximation. The first step (k2) of the reaction was recognized as the rate determining step
on the basis of experimental data.
