KINETIC INVESTIGATION OF THE REACTIONS BETWEEN TRIPHENYLPHOSPHINE, DIALKYL ACETYLENEDICARBOXILATES AND NH-ACID, SUCH AS 5,6-DIMETHYL BENZIMIDAZOLE BY THE UV SPECTROPHOTOMETRY TECHNIQUE

摘要: The work was undertaken to carry out kinetic studies of the reactions between triphenylphosphine and dialkyl acetylenedicarboxylates in presence NH-acid, such as 5,6-dimethyl benzimidazole. To determine parameters reactions, they were monitored by UV spectrophotometery. second order fits automatically drawn software associated with instrument at an appropriate wavelength. values rate constant (k_2) calculated, using standard equations within program. At temperature range studied, dependence (ln k_2) on reciprocal agreement Arrhenius equation. This provided relevant plots calculate activation energy all reactions. Furthermore, useful information obtained from effect solvent, structure reactants (different alkyl groups acetylenedicarboxylates)and, also, concentration