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Wyszukujesz frazę "Muthukumar, S." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Synthesis, characterization and evaluation of mosquito larvicidal effect of 1,3,4-oxadiazole derivatives against Culex quinquefasciatus
Autorzy:
Santhanalakshmi, K.
Kalyanasundharam, S.
Muthukumar, S.
Rosy, P. Jacquline
Powiązania:
https://bibliotekanauki.pl/articles/1112036.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1
3
4-oxadiazole
Culex quinquefasciatus
Larvicidal bioassay
ultrasonic irradiation
Opis:
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.
Źródło:
World News of Natural Sciences; 2018, 19; 58-64
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microwave Synthesis, spectroscopic characterization and DFT investigation of 4-(4-(2-(4-substitutedphenyl)-4-oxothiazolidin-3-yl)benzyl)oxazolidin-2-one derivatives
Autorzy:
Rosy, P. Jacquline
Kalyanasundaram, S.
Santhanalakshmi, K.
Muthukumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/1182446.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-arylthiazolidine
FT-IR
HOMO–LUMO
hyperpolarizability
Opis:
A series of some novel 4-(4-(2-(4-substitutedphenyl)-4-oxothiazolidin-3-yl)benzyl)oxazolidin-2-one (6-10) derivatives were designed and synthesized under microwave irradiation. The synthesized compound was purified by crystallization using ethanol. The structure of the synthesized compound was assigned on the basis of the spectral data. IR spectrum showed the expected absorption frequencies and signals of this compound. To identify the stable structure, conformational analysis was performed using B3LYP/6-31 G(d,p) level of calculation. For the stable conformer the bond parameters were calculated by the same basis set. Results obtained at this level of theory were used for a detailed interpretation of the FT-IR spectra. The energy gap of the molecule was found using HOMO and LUMO calculation. Atomic charges of the carbon, nitrogen and oxygen were calculated using same level of calculations. The optimized geometric parameters and the theoretical vibrational frequencies were found to be in good agreement with the corresponding experimental data and with the results found in the literature.
Źródło:
World Scientific News; 2017, 69; 122-142
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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