Kinetic and mechanism investigation of the reactions between triphenylphosphine, dialkyl acetylenedicarboxilates and NH-acids such as 2-acetylpyrrole and 2-pyrrolecarbaldehyde by UV

Habibi Khorassani, Sayyed Mostafa and Ebrahimi, Ali and Zakarianezhad, Mohammad and Karimi, Puya (2008) Kinetic and mechanism investigation of the reactions between triphenylphosphine, dialkyl acetylenedicarboxilates and NH-acids such as 2-acetylpyrrole and 2-pyrrolecarbaldehyde by UV. In: 11th Iranian Physical Chemistry Seminar-July 2008.

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Abstract

The works undertaken were to carry out kinetic studies of the reactions between triphenylphosphine, dialkyl acetylenedicarboxylates in the presence of NH-acid, such as 2-acetylpyrrole or 2-pyrrolecarbaldehyde. To determine the kinetic parameters of the reactions, they were monitored by UV spectrophotometery. The second order fits were automatically drawn and the values of the second order rate constant (k2) were calculated using standard equations within the program. At the temperature range studied the dependence of the second order rate constant (Ln k2) on reciprocal temperature was in agreement with Arrhenius equation. This provided the relevant plots to calculate the activation energy of all reactions. Furthermore, useful information were obtained from studies of the effect of solvent, structure of reactants (different alkyl groups within the dialkyl acetylenedicarboxylates and NH-acids) and also concentration of reactants on the rate of reactions. Proposed mechanism was confirmed according to the obtained results and steady state approximation and first step (k2) of reaction was recognized as a rate determining step on the basis of experimental data.

Item Type: Conference or Workshop Item (Poster)
Persian Title: Kinetic and mechanism investigation of the reactions between triphenylphosphine, dialkyl acetylenedicarboxilates and NH-acids such as 2-acetylpyrrole and 2-pyrrolecarbaldehyde by UV
Persian Abstract: -
Subjects: Divisions > Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Divisions: Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Subjects > Conferences > 11th Iranian Physical Chemistry Seminar- July 2008
Date Deposited: 17 Jun 2019 05:04
Last Modified: 17 Jun 2019 05:04
URI: http://repository.uma.ac.ir/id/eprint/6793

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