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Wyświetlanie 1-4 z 4
Tytuł:
Synthesis, spectral correlations and antimicrobial activities of some 2-hydroxyphenyl-styrylketone
Autorzy:
Sathiyamoorthi, K.
Mala, V.
Suresh, R.
Sakthinathan, S.P.
Kamalakkannan, D.
Ranganathan, K.
Arulkumaran, R.
Sundararajan, R.
Vijayakumar, S.
Vanangamudi, G.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/411660.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
solvent-free synthesis
SiO2-H3PO4
2’-hydroxyphenylchalcones
UV
IR
NMR spectra
Opis:
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.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 7, 2; 102-119
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent-free synthesis and assessment of substituent effects from IR & NMR spectra of some substituted benzylidene-5-ethyl-1,3,4-thiadiazole-2-amines
Autorzy:
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/411670.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Benzylidene-5-ethyl-1
3
4-thiadiazole-2-amines
solvent-free synthesis
SiO2
H3PO4
IR spectra
NMR spectra
Hammett correlation
Opis:
A series containing ten titled compounds were synthesized by SiO2:H3PO4 catalyzed solvent-free condensation of substituted benzaldehydes and 2-amino-5-ethyl-1,3,4-thiadiazole under microwave irradiation. The yields of prepared amines are more than 90 %. The synthesized amines were characterized by their physical constants and spectroscopic data reported in literature earlier for known compounds. The assigned spectral group frequencies such as infrared νC=N, C-S-C, N-N (cm-1) and NMR chemical shifts (δ, ppm) of CH, C=N have been correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analyses, the effects of substituent on the above spectral data have been discussed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 5; 89-98
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent-free synthesis, antimicrobial and insect antifeedant potentials of some 4(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines
Autorzy:
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1075725.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
3-oxazine-2-amines
4-(4-chloro-1-naphthyl)-5
6-dihydro-6-(substituted phenyl)-4H-1
SiO2-H3PO4
antimicrobial potentials
insect antifeedant activity
solvent-free synthesis
Opis:
More than 85% yields of thirteen 4-(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines weer synthesised by SiO2-H3PO4 catalyzed solvent-free cyclization of substituted styryl4-chloro-1-naphthyl ketones and urea under microwave irradiation. The synthesized oxazine amines have been characterized by analytical and spectroscopic techniques. The antimicrobial activities of these 4-(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines have been appraised by means of Bauer-Kirby technique. The insect antifeedant activities of these oxazine-2-amines were assessed by Dethler’s technique using 4th instar larvae Achoea janata L.
Źródło:
World Scientific News; 2019, 118; 1-16
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and effects of substituent on (E)-styryl-3-methyl-2-thienyl chalcones
Autorzy:
Christuraj, P.
Geetha, C.
Vanangamudi, G.
Arulkumaran, R.
Manikandan, V.
Rajakumar, P. R.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1161056.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
(E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones
FT-IR & NMR spectra
Fly-ash:H3PO4 nanocatalyst
Hammett correlation analysis
Substituent effects
UV
solvent-free synthesis
Opis:
Series of eleven substituted of (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-ones compounds by cross-aldol condensation reaction of 3-methylthiophene-2-carbaldehyde with various substituted acetaldehyde in the occurrence of Fly-Ash: H3PO4 catalyst. The effect of catalytic activity of this fly-ash:H3PO4 nanocatalyst was studied with the obtained yield of products under solvent-free conditions. The synthesized substituted (E)-3-(3-methylthiophen-2-yl)-1-phenylprop-2-en-1-one compounds was characterized by physical constants, UV, FT-IR, 1H & 13C-NMR spectral data. The infrared group frequencies of ʋ(cm-1) of COs-cis & s-trans, CHip and CHop, CH=CHop, >C=C
Źródło:
World Scientific News; 2018, 112; 55-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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