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    Wyświetlanie 1-7 z 7
    Tytuł:
    Hammett spectral correlations in some aryl 1,3-oxazine-4-thione derivatives
    Autorzy:
    Thirunarayanan, G.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412394.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    1,3-oxazine-4-thiones
    IR spectra
    13C NMR spectra
    Hammett correlation
    Opis:
    A series of some aryl 1,3-oxazine-4-thione derivatives have been synthesized by 1-methyl imidazole catalyzed three component one pot synthetic method in room temperature. The purities of these thiones were studied by their physical constants and spectroscopic data. The infrared and 13C NMR spectral data of CN and CS were correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituent on the spectral data was studied.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 193-200
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FT-IR and NMR spectral LFER model analysis on some 3-(1-naphthyl)-1-substituted phenyl chalcones
    Autorzy:
    Sekar, K. G.
    Janaki, P.
    Muthuvel, I.
    Sathiyendiran, V.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031827.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    1-Naphthyl styryl ketone
    Aldol condensation
    IR and NMR Spectra
    LFER Model
    Opis:
    In this investigation, the authors predicted the effects of substituents on the functional groups of the titled chalcones using Linear Free Energy Relationship through Hammett equation with its constants and Swain-Lupton parameters. The LFER model statistical analysis was carried out using single and multi-linear regression analysis in MS Office 365 XL package. From the LFER analysis outcome, the influence of substituents on the spectroscopic functionality were discussed with their electronic effects such as, polar, inductive, resonance, field and conjugation. The titled compounds were prepared by solvent-free Aldol-Condensation method. The prepared compounds were characterised by their physical constants, micro analysis and spectroscopic data (FT-IR, NMR and Mass).
    Źródło:
    World Scientific News; 2020, 147; 88-103
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave assisted sulphated titania catalyzed aldol condensation: Synthesis of some (E) 3-(2-naphthyl)-1-(substituted phenyl)-2-propen-1-ones under solvent-free conditions
    Autorzy:
    Janaki, P.
    Sekar, K. G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411813.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    aldol condensation
    sulphated titania
    microwave irradiation
    2-propen-1-ones
    Opis:
    A series of titled chalcones were synthesized by aldol condensation between 2-naphthaldehyde and various substituted acetophenones using solid acidic solid sulphated titania catalyst under microwave irradiation. The yields of these chalcones are more than 90 %. The synthesized chalcones are characterized by their physical constants, analytical and spectroscopic data.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 9; 16-22
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preheated fly-ash catalyzed cyclization ofchalcones: Synthesis of some substituted pyrazole-1-carbothioamides and spectral correlations in 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1 carbothioamides
    Autorzy:
    Thirunarayanan, G.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412612.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Pre-heated fly-ash
    solvent-free synthesis
    Hammett correlations
    3-(3, 4-dichlorophenyl)-5-(substituted phenyl)-4
    5-dihydro-1H-pyrazole-1-carbothioamides
    Opis:
    Some substituted 1-thiocarbomyl pyrazolines including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides using solvent-free preheated fly-ash catalyzed cyclization between chalcones and thiosemicarbazide microwave irradiation. The yields of these thiocarbomyl pyrazolines are more than 80 %. The purities of these synthesised pyrazoline derivatives are checked by their physical constants and spectral data earlier reported in the literature The spectral data of these 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides had been correlated, using single and multi-linear regression analysis.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 18-34
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Greener synthesis and Hammett spectral Linearity’s of some 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines
    Autorzy:
    Thirunarayanan, G.
    Rajarajan, M.
    Sekar, K. G.
    Sathiyendiran, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179600.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hammett equation and Regression analyses
    Hammett substituent constants
    IR and NMR spectra
    Piperazines
    Opis:
    We have synthesized eleven numbers of 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines by hydroxyapatite catalyzed microwave assisted condensation method. The synthesized 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazine compounds were characterized by means of their IR and NMR spectral data. The assigned infrared spectral νC=N, νC-O-C stretches(cm-1), NMR chemical shifts of isoxazoline (d) proton, isoxazoline (m) proton, N-CH3, C=N, C-NH2 and C-NH3 (δ, ppm) of these 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines were assigned and 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 substituents on the above group frequencies were discussed.
    Źródło:
    World Scientific News; 2017, 74; 164-180
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared and NMR spectral Hammett correlations in 4-(2-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines
    Autorzy:
    Thirunarayanan, G.
    Pazhamalai, S.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411654.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxazine-2-amines
    IR and NMR spectra
    Hammett equation
    Correlation analysis
    Opis:
    A series containing ten titled compounds have been synthesised and recorded the IR and NMR spectra. From the spectra the infrared νNH, C=N, C-O-C stretches, NMR chemical shifts of (δ, ppm) NH and C=N were assigned and correlated with Hammett substituent constants, F and R parameters using single regression analysis. From the results, the effects of substituent on the above spectral frequencies were discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 8; 38-46
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral QSAR and QPR study of some (E)-4-(((2 hydroxy-6-(substituted phenyl)-1,6 dihydropyrimidin 4-yl)methyl)diazenyl)benzoic acid derivatives
    Autorzy:
    Thirunarayanan, G.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412619.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dihydropyrimidines
    Diazenyl benzoic acids
    IR spectra
    NMR spectra
    Hammett correlation
    QSAR and QPR study
    Opis:
    A series of titled compounds were synthesized and recorded the infrared and NMR spectra. The assigned spectral group frequencies were correlated with Hammett substituent constants, F and R parameter. From the statistical analysis results, the effect of substituents on the spectral group frequencies has been studied.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 1; 10-20
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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