Kinetic Investigation of the Reaction between Triphenylphosphine, Dialkyl Acetylenedicarboxylate, and Carbazole by the UV Spectrophotometry Technique

Author: Khorassani Sayyed   Maghsoodlou Malek   Ebrahimi Ali   Roohi Hosein   Zakarianezhad Mohammad   Dasmeh Hamid   Moradian Majid  

Publisher: Taylor & Francis Ltd

ISSN: 1042-6507

Source: Phosphorus, Sulfur, and Silicon and the Related Elements, Vol.181, Iss.5, 2006-06, pp. : 1103-1115

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Abstract

The major objectives of the work undertaken were to carry out kinetic studies of the reaction between triphenylphosphine and dialkyl acetylenedicarboxylate in the presence of strong NH-acids, such as carbazole. To determine the kinetic parameters of the reaction, it was monitored by the UV spectrophotometer technique. The values of the second order rate constant (k 2 ) were automatically calculated using standard equations within the program when the second order fits of the mentioned reactions were automatically drawn by the software associated with a Cary UV spectrophotometer model Bio-300 at an appropriate wavelength. At the temperature range studied, the dependence of the second order rate constant (Ln k) 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 and different alkyl groups within the dialkyl acetylenedicarboxylates on the rate of reactions.

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