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    Wyświetlanie 1-15 z 15
    Tytuł:
    Spectral correlations and antimicrobial activities of some 1-pyrenyl chalcones
    Autorzy:
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Sakthinathan, S.P.
    Kamalakkannan, D.
    Suresh, R.
    Ranganathan, K.
    Rajakumar, P.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411776.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 1-pyrenyl ketones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    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.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 5; 21-38
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlation analysis and antimicrobial activities of some 2,4-dimethoxy phenyl chalcones
    Autorzy:
    Joseph, S. J.
    Arulkumaran, R.
    Kamalakkannan, D.
    Sakthinathan, S. P.
    Sundararajan, R.
    Suresh, R.
    Vijayakumar, S.
    Ranganathan, K.
    Kalyanasundaram, N.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412661.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 2
    4-dimethoxy phenyl ketones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    A series of 2,4-dimethoxy phenyl chalcones have been synthesized by Crossed-Aldol condensation of 2,4-dimethoxy phenyl and various 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 effects of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 4; 48-65
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of substituent effects and antimicrobial activities of some 2ʹ,5ʹ-dimethyl phenyl chalcones
    Autorzy:
    Joseph, S. J.
    Kamalakkannan, D.
    Arulkumaran, R.
    Sakthinathan, S. P.
    Suresh, R.
    Sundararajan, R.
    Vijayakumar, S.
    Ranganathan, K.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412597.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 2
    5ʹ-dimethyl phenyl chalcones
    UV spectra
    IR spectra
    NMR spectra
    substituent effects
    antimicrobial activities
    Opis:
    Some 2ʹ,5ʹ-dimethyl phenyl chalcones have been synthesized by Crossed-Aldol condensation between 2,5-dimethyl acetophenone and various substituted benzaldehydes using catalytic amount of sodium hydroxide and ethanol. The yields of the chalcones are more than 93 %. 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 effects of substituents on the spectral group frequencies have been discussed. The anti-microbial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 5; 99-123
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations in some substituted styryl (E)-4-((2-oxopropyl) diazenyl) benzoic acids
    Autorzy:
    Sathiyendiran, V.
    Sekar, K. G.
    Thirunarayanan, G.
    Arulkumaran, R.
    Sundararajan, R.
    Kamalakkannan, D.
    Suresh, R.
    Manikanadan, V.
    Vijayakumar, R.
    Vanangamudi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412199.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxo-propyl diazenyl benzoic acid chalcones
    IR spectra
    NMR spectra
    Hammett equation
    Regression analysis
    Opis:
    A series of titled compounds were prepared and analyzed their purities by literature method. The infrared and NMR spectral group frequencies of the compounds were assigned and correlated with Hammett substituent constants, F and R constants using single and multi linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral frequencies was discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 33-43
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    IR and 1H NMR spectral studies of some 2-Amino-4-isopropyl-6-methoxy-N-phenylpyrimidine-5-carboxamides: Assessment of substituent effects
    Autorzy:
    Arulkumaran, R.
    Sundararajan, R.
    Manikandan, V.
    Sathiyendiran, V.
    Pazhamalai, S.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412343.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    2-Amino-4-isopropyl-6-methoxy-N-phenylpyrimidine-5-carboxamides
    IR spectra
    NMR spectra
    substituent effects
    Opis:
    A series of 2-Amino-4-isopropyl-6-methoxy-N-phenylpyrimidine-5-carboxamide compounds have been synthesized from various substituted dithioacetal and guanidine. The purities of these compounds were checked by their physical constants, UV, IR, NMR and MASS spectral data. The IR and 1HNMR spectral data of these compounds 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 effects of substituents on the spectral group frequencies have been discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 15-25
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hammett spectral LFER of some antioxidant substituted benzylidene hydrazines
    Autorzy:
    Thirunarayanan, G.
    Manikandan, V.
    Arulkumaran, R.
    Rajarajan, M.
    Sathiyendiran, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182556.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (E)-(2
    5-dinitrophenyl)-2-(substituted benzylidene)hydrazines
    Hammett correlations
    IR spectra
    NMR spectra
    antioxidant activity
    hydroxy apatite
    Opis:
    About nine (E)-(2,5-dinitrophenyl)-2-(substituted benzylidene)hydrazines have been synthesized by hydroxy apatite catalyzed condensation of 2,4-dinitrophenyl hydrazine and substituted benzaldehydes under microwave irradiation conditions. The obtained yields of these hydrazines are more than 85%. The purities of synthesized hydrazines are examined by the analytical and spectroscopic data reported earlier. The infrared spectral C=N, NH frequencies (v, cm-1) and the NMR spectral chemical shifts of CH, NH protons and carbons are assigned and are correlated with Hammett substituent constants, F and R parameter using single and multi-regression analysis. From the results of statistical analysis the effects of substituent on the group frequencies have been discussed. The antioxidant activities of these synthesized hydrazines were measured using DPPH radical scavenging method. The hydroxy- and methoxy- substituted hydrazines shows significant antioxidant activity.
    Źródło:
    World Scientific News; 2017, 69; 201-219
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and spectral correlation studies of some substituted (E)-1-Benzylidene-2-(diphenylmethylene) hydrazines
    Autorzy:
    Arulkumaran, R.
    Manikandan, V.
    Christuraj, P.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182844.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (e)-1-benzylidene-2-(diphenylmethylene) hydrazine
    ir and nmr spectra
    hammett correlations
    Opis:
    About ten substituted (E)-1-Benzylidene-2-(diphenylmethylene) hydrazine compounds have been synthesized. They are characterized by their analytical, ultraviolet, infrared and NMR spectral data. From infrared spectra, the CN and N+N vibrational frequencies (cm-1) of the hydrazines have been assigned. From NMR spectra, the chemical shifts (, ppm) of CH proton and C(C6H5)2 carbons of the hydrazines have been assigned. These data are 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 substituents on the spectral data have been discussed.
    Źródło:
    World Scientific News; 2017, 62; 93-110
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and spectral correlation studies of some (E)-N′-1-(substituted benzylidene) benzohydrazides
    Autorzy:
    Manikandan, V.
    Balaji, S.
    Senbagam, R.
    Vijayakumar, R.
    Rajarajan, M.
    Vanangamudi, G.
    Arulkumaran, R.
    Sundararajan, R.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1162032.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (E)-N’-1-(substituted benzylidene) benzohydrazides
    IR and NMR spectra and Correlations
    UV
    Opis:
    About ten substituted (E)-N’-1-(substituted benzylidene) benzohydrazides have been synthesized. They are characterized by their analytical, ultraviolet, infrared and NMR spectral data. The effects of substituent on these data have been studied using Hammett equation.
    Źródło:
    World Scientific News; 2018, 111; 26-39
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Hammett spectral correlation studies of some substituted cyanopyridine compounds
    Autorzy:
    Arulkumaran, R.
    Manikandan, V.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179260.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hammett constants
    IR and NMR spectra
    Single and multi-correlation analysis
    Substituted cyanopyridine
    Opis:
    About ten substituted cyanopyridine compounds have been synthesized and the purities of these pyridines were examined with their physical constants, analytical and spectroscopic data provided in the literature. They are characteristic infrared stretches and NMR chemical shifts were assigned and they are correlated with Hammett substituent constants using single and multi-linear regression analysis. From the results, the effect of substituents on the spectral data of cyanopyridine has been discussed.
    Źródło:
    World Scientific News; 2017, 80; 239-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations and antimicrobial activities of some (E)-N-Benzylidenepyridin-2-amines
    Autorzy:
    Sakthinathan, S. P.
    Suresh, R.
    Mala, V.
    Sathiyamoorthi, K.
    Kamalakkannan, D.
    Ranganathan, K.
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412108.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxidative coupling Solvent-free synthesis
    fly-ash
    PTS
    Aryl imines
    IR and NMR spectra
    Opis:
    A series of aryl imines have been synthesized by Fly-ash: PTS catalyzed microwave assisted oxidative coupling of amines and aldehydes under solvent-free conditions. The yield of the imines has been found to be more than 90 %. The purity of all imines has been checked using their physical constants and spectral data as published earlier in literature. The UV ?maxC=N(nm), infrared ?C=N(cm-1), NMR ?(ppm) of CH=N and C=N spectral data have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied. The antimicrobial activities of all imines have been studied using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 6; 77-90
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Insect antifeedant potent halogen substituted phenyl chalcones
    Autorzy:
    Sundararajan, R.
    Arulkumaran, R.
    Vijayakumar, S.
    Kamalakkannan, D.
    Suresh, R.
    John, J. S.
    Ranganathan, K.
    Sakthinathan, S. P
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412081.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Substituted styryl 2′,3′,4′-trichlorophenyl ketones
    sulfated Titania
    IR and NMR spectra
    Insect antifeedant activities
    Opis:
    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.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 1; 67-73
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Hammett spectral QSAR analysis of some (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
    Autorzy:
    Vijayakumar, S.
    Manikandan, V.
    Arulkumaran, R.
    Christuraj, P.
    Sundararajan, R.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076503.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
    IR
    NMR spectra
    QSAR study
    UV
    regression analysis
    Opis:
    About nine substituted (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones have been synthesized by solvent-free method. These enones were analyzed by spectral techniques. The characteristic spectral frequencies were correlated through Hammett equation with Hammett substituent constants, F and R parameters using single and multi-regression analysis method. From the statistical analysis results, the quantitative structure activity relationships have been discussed by means of effects of substituents on the spectral frequencies.
    Źródło:
    World Scientific News; 2019, 115; 52-67
    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
    Tytuł:
    Thionylchloride catalyzed aldol condensation: Synthesis, spectral correlation and antibacterial activities of some 3,5-dichloro-2-hydroxyphenyl chalcones
    Autorzy:
    Arulkumaran, R.
    Vijayakumar, S.
    Sundararajan, R.
    Sakthinathan, S. P.
    Kamalakkannan, D.
    Suresh, R.
    Ranganathan, K.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411825.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    chlorek tionylu
    widma IR i NMR
    korelacja Hammeta
    aktywność antybakteryjna
    wpływ podstawników
    styrylo 3,5-dichloro-2-hydroksy fenylo ketony
    thionyl chloride
    styryl 3,5-dichloro-2-hydroxyphenyl ketones
    IR and NMR spectra
    Hammett correlation
    substituent effects
    antimicrobial activities
    Opis:
    A series of substituted styryl 3,5-dichloro-2-hydroxyphenyl ketones [1-(3, 5-dichloro-2-hydroxy)- 3-phenylprop-2-en-1-one] were synthesized using thionyl chloride assisted Crossed Aldol reaction. The yields of chalcones were more than 80%. The synthesized chalcones were characterized by analytical and spectroscopic data. From the spectroscopic data the group frequencies were correlated with Hammett substituent constants, F and R parameters. From the results of statistical analysis the effect of substituents were discussed. The antibacterial activities of these chalcones have been evaluated using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 4; 17-38
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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