Wyniki wyszukiwania - Biblioteka Nauki

Ten serwis zostanie wyłączony 2025-02-11.

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

3 International Letters of Chemistry, Physics and Astronomy

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Insect antifeedant potent halogen substituted phenyl chalcones

100%

Sundararajan R. , Arulkumaran R. , Vijayakumar S. , Kamalakkannan D. , Suresh R. , John J. S. , Ranganathan K. , Sakthinathan S. P. , Vanangamudi G. , Thirunarayanan G.

tom Vol. 1

67-73

Some 2′,3′,4′-trichlorophenyl chalcones [(E)-1-(2,3,4-trichlorophenyl)-3-(substituted phenyl)-2-propen-1-ones] have been synthesised using sulfated Titania catalyzed solvent-free aldol condensation between 2,3,4-trichloroacetophenone and substituted benzaldehydes. The purities of synthesised chalcones were checked by their analytical, physical and spectroscopic data reported in literature. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L by castor leaf disc bio-assay method. The chloro substituted chalcones shows significant insect antifeedant activity.

Spectral correlations and antimicrobial activities of some 1-pyrenyl chalcones

100%

Arulkumaran R. , Vijayakumar S. , Sundararajan R. , Sakthinathan S. P. , Kamalakkannan D. , Suresh R. , Ranganathan K. , Rajakumar P. R.

tom Vol. 5

21-38

A series of 1-pyrenyl chalcones have been synthesized by Crossed-Aldol condensation of 1-acetylpyrene and substituted benzaldehydes. The purities of these chalcones have been checked by their physical constants, UV, IR, NMR and MASS spectral data. The spectral data of these chalcones have been correlated with Hammett sigma constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.

Synthesis, spectral correlations and antimicrobial activities of some 2-hydroxyphenyl-styrylketone

80%

Sathiyamoorthi K. , Mala V. , Suresh R. , Sakthinathan S. P. , Kamalakkannan D. , Ranganathan K. , Arulkumaran R. , Sundararajan R. , Vijayakumar S. , Vanangamudi G. , Thirunarayanan G.

2013

tom Vol. 7, iss. 2

102--119

Some 2’-hydroxyphenylchalcones have been synthesized under microwave irradiation by Claisen-Schmidt condensation between substituted 2-hydroxyacetophenone and substituted benzaldehydes using catalytic amount of SiO2-H3PO4. These chalcones were established by their physical constants and spectroscopic data published earlier. The UV, IR, 1H NMR and 13C NMR spectral data of these chalcone have correlated with Hammett substituent constants, F and R parameters. All the compounds have been subjected to screened for antimicrobial activity.