K Rajasekaran
Articles written in Journal of Chemical Sciences
Volume 120 Issue 3 May 2008 pp 325-328
V Raj T Chandrakala K Rajasekaran
Kinetics of cleavage of phenylphenyl acetates (PPA) and several
Volume 120 Issue 5 September 2008 pp 475-480
Micellar catalysis in the retro-Knoevenagel reaction of ethyl-𝛼-cyanocinnamates
K Rajasekaran A Sarathi S Ramalakshmi
Kinetics of base catalysed hydrolytic cleavage of ethyl 𝛼-cyanocinnamate (ECC) and several para-substituted ECC have been investigated spectrophotometrically in the presence of anionic surfactant sodium laurylsulphate (NaLS). The rate of cleavage of ECC was retarded by NaLS. The pseudo-first order rate constants, $k_{\text{obs}}$, correlate with the Hammett $\sigma^+_p$ - constants. The $\rho^+$ value (0.86) in aqueous medium is less than $\rho^+$ value (1.11) in 0.02 M NaLS. Kinetic data were analysed by Menger-Portnoy and Piszkiwicz model. The substrate-micelle binding constants, $K_s$, correlate with the Hammett 𝜎-constants and Hansch hydrophobicity constants - 𝜋 of the substituents.
Volume 121 Issue 4 July 2009 pp 529-534
V Raj A Sarathi T Chandrakala S Dhanalakshmi R Sudha K Rajasekaran
The rates of alkaline bleaching of triphenylmethane dyes crystal violet (CV), malachite green (MG) and rosaniline (RA) have been measured spectrophotometrically in an aqueous medium at 30°C in the presence of 𝛽-cyclodextrin (CD). At lower concentrations of CD, CV forms productive 1 : 1 (G : H) complex. At higher concentrations of CD, it forms unproductive 1 : 2 (G : H) complex. For the bleaching of MG, CD accelerates or decelerates the rate depending on pH of the medium by forming 1 : 1 (G : H) inclusion complex. Analysis of rate data shows that MG undergoes fading by mixed order process. CD decelerates the water reaction and accelerates hydroxide ion reaction. In the case of RA, both water reaction as well as hydroxide ion reaction are retarded by CD by the formation of inclusion complex.
Volume 135, 2023
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