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Synthesis, characterization and evaluation of mosquito larvicidal effect of 1,3,4-oxadiazole derivatives against Culex quinquefasciatus

100%

Santhanalakshmi K. , Kalyanasundharam S. , Muthukumar S. , Rosy P. J.

tom 19

A new series of 1,3,4-oxadiazole derivatives were prepared from the condensation of acid hydrazide,5-bromo-2-(trifluoromethoxy)benzoic acid in POCl3 by ultrasonic irradiation method. The new synthetic method furnished the desired products in shorter time and good yields. The chemical structures of compounds 4a-h were confirmed by Fourier transform infrared spectroscopy (IR), proton nuclear magnetic resonance (1H-NMR), carbon nuclear magnetic resonance (13C-NMR) and elemental analyses. Larvicidal bioassay tests were performed using several 2-(5-bromo-2-(trifluoromethoxy) phenyl)-5-aryl-1,3,4-oxadiazole. These synthesized compounds presented strong larvicidal activity against urban mosquitoes Culex quinquefasciatus. The results suggest that larvicidal activity might be correlated with the presence of electron-withdrawing substituents in the para position of the phenyl ring. The alterations observed in the larvae spiracular valves of the siphon and anal papillae by 1,3,4- oxadiazoles in the larvicidal bioassay are responsible for larvae’s death.

Microwave synthesis, spectroscopic characterization and DFT investigation of 4-(4-(2-(4-substitutedphenyl)-4-oxothiazolidin-3-yl)benzyl)oxazolidin-2-one derivatives

100%

Rosy P. J. , Kalyanasundaram S. , Santhanalakshmi K. , Muthukumar S.

World Scientific News

2017

tom 69

Study of Coordination Characteristics of some Metal Complexes of 2-Thiouracil by Infrared Spectroscopy

88%

Rosy P. J. , Kalyanasundharam S. , Santhanalakshmi K. , Muthukumar S. , Manivannan P.

International Letters of Chemistry, Physics and Astronomy

2015

tom Vol. 49

74--80

The infrared spectra of 2-Thiouracil (Thu) have been recorded in the region 4000-400 cm-1. The assignments of fundamental frequencies have been proposed on the basis of assignments in related molecules. Correlation of vibrational assignments with those of related molecules have been pointed out. The metal ion interactions of Thu with Cd (II), Hg (II), Cu (II), and Zn (II) bromides have been investigated by infrared spectroscopy. The results are consistent with the bonding of ligands through sulphur in all the complexes. The vibrational frequencies of metal complexes of 2-Thiouracil are correlated with the spectral data of other structurally related pyrimidine thione complexes.