Spectrophotometric determination and kinetic studies of condensation of aromatic aldehydes with 2-thiobarbituric acid
Zahran, AA; Medien, Hesham;
Abstract
The condensation reaction of 2-thiobarbituric acid with aromatic aldehydes in ethanol has been investigated spectrophotometrically at 30-50°;C. The reaction was catalyzed by HCl solutions. The reaction follows overall second order kinetics, first order each in reactant. Activation parameters have been calculated from the dependence of the rate constants on temperature. The rate of condensation increases with the presence of electron donating groups on the aromatic ring of the aldehyde. The rate-determining step involves dehydration of the aldol intermediate. Based on this reaction, determination of 13 aromatic aldehydes in a concentration range of 0.149-76 mu;g/ml is proposed.
Other data
| Title | Spectrophotometric determination and kinetic studies of condensation of aromatic aldehydes with 2-thiobarbituric acid | Authors | Zahran, AA; Medien, Hesham | Keywords | 2-Thiobarbituric Acid, Aromatic Aldehydes, DeterminationKinetic | Issue Date | 2003 | Publisher | Taylor \& Francis | Journal | Phosphorus, Sulfur, and Silicon and the Related Elements | Volume | 178 | Issue | 5 | Start page | 1069 | End page | 1080 | DOI | 10.1080/10426500307859 |
Attached Files
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.