عنوان به زبان ديگر :
Kinetic Investigation of the Reactions Between Triphenylphosphine, Dialkyl Acetylenedicarboxilates and NH-Acid, such as 5,6-Dimethyl Benzimidazole by the UV Spectrophotometry Technique
پديد آورندگان :
Habibi Khorassani S.M نويسنده , Maghsoocllou M.T نويسنده , Ebrahimi A. نويسنده , Mohammadzadeh P. نويسنده , Zakarianezhad M. نويسنده , Fattahi M. نويسنده
چكيده لاتين :
The work was undertaken to carry out kinetic studies of the reactions between triphenylphosphine
and dialkyl acetylenedicarboxylates in the presence of NH-acid, such as 5,6-dimethyl benzimidazole.
To determine the kinetic parameters of the reactions, they were monitored by UV
spectrophotometery. The second order fits were automatically drawn by the software associated
with the UV instrument at an appropriate wavelength. The values of the second order rate
constant (k2) were automatically calculated, using standard equations within the program. At the
temperature range studied, the dependence of the second order rate constant (In k2 ) on reciprocal
temperature was in agreement with the Arrhenius equation. This provided the relevant plots to
calculate the activation energy of all reactions. Furthermore, useful information was obtained
from studies of the effect of solvent, the structure of the reactants (different alkyl groups within
the dialkyl acetylenedicarboxylates) and, also, the concentration of the reactants on the rate of
the reactions
