Mustafa Cebe

Determination of Steric Effect on the Esterification of Different Alcohols with Propanoic Acid over Cation-exchange Resin Catalyst Dowex 50Wx4

Abstract This paper describes the application of LFER in the form of Taft correlation to understand the mechanism of the esterification of propanoic acid with different alcohols over heterogeneous catalyst, Dowex 50Wx4. The rate constant (k1) in the rate equation decreases with change of alcohols in the order methanol, ethanol, n-propyl, n-butyl, n-pentyl, iso-butyl, iso-propyl and sec-butyl (2-buthanol). The reaction of propanoic acid with alcohols fits the Taft equation, log k1/kCH3 = 1.0061 Es - 0.0012, which implies that the steric effect of the substituent governs that reaction and the mechanism is similar between the different alcohols. The experimental results were modelled according to a simple second-order model. It was found that the equilibrium constant of this reaction does not depend on the structure of the organic alcohols, and has for 333 K the value 4.04.

Volumetric, Chromatographic, Refractometric Studies on the Esterification of Methanol with Acetic Acid in the Presence of Cation-Exchange Resins

Summary Esterification of methyl alcohol with acetic acid catalysed by commercially available polymeric ion-exchange resins Amberlyst-15, Dowex 50W and Amberlite IR-120 was carried out in the temperature ranging between 323–338K. Mesh sizes and divinylbenzene contents had virtually no effect on the rate the data of which were correlated with a second-order homogeneous reaction. The samples were analysed with gas chromatography, refractometry and volumetry. The reproducibilities were the order of ±2.89%, ±5.07% and the order of ±6.58% respectively for the volumetric, chromatographic and refractometric methods.

The Study of Energy Change in Radical Systems

A number of theoretical investigations have been developed in order to describe the kinetics of a homogenous electron self exchange reaction,1

Polarizabilities and dipole moments of benzaldehyde, benzoic acid and oxalic acid in polar and nonpolar solvents

\text{R + R}^{\bar \cdot } \mathop \rightleftharpoons \limits^{\text{K}_{\hom } } \text{R}^{\bar \cdot }

Solvents effect on infrared spectra of trimethyl phosphate in organic solvents

(1) and heterogenus

Investigation of dissociation properties of oxalic acid–solvent systems by UV-spectrophotometry

\text{R + e}^ - \mathop \rightleftharpoons \limits^{\text{K}_{\text{het}} } \text{R}^{\bar \cdot }