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    Wyświetlanie 1-11 z 11
    Tytuł:
    IR & NMR spectral studies of some 7-substituted 9H-fluorenacyl bromides: Assessment of substituent effects
    Autorzy:
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412017.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    9H-Fluorenacyl bromides
    IR and NMR spectra
    Hammett substituent constants
    Correlation analysis
    Opis:
    A series of some 2-bromo-1-(2-substituted 9H-fluorene-7-yl)ethanones have been prepared. The purities of these ethanones have been checked by their physical constants and spectroscopic data. The spectral group frequencies of these enones have been assigned and correlated with Hammett substituent constants, F and R parameters. From the results of statistical analyses, the effects of substituent have been discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 152-161
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on spray pyrolised nanostructured SnO2 thin films for H2 gas sensing application
    Autorzy:
    Bari, R. H.
    Patil, S. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/411918.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Spray Pyrolysis
    Nanostructured SnO2
    thin films
    H2 gas sensor
    Microstrain
    Electrical conductivity
    Opis:
    The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrophotometer (EDAX). The information of crystallite size, dislocation density and microstrain is obtained from the full width-at half- maximum (FWHM) of the diffraction peaks. Effect of sprayed deposition temperature on H2 gas sensing performance and electrical properties were studied using static gas sensing system. The sensor (Tpyr. = 350 °C) showed high gas response (S = 1200 at 350 °C) on exposure of 500 ppm of H2 and high selectivity against other gases The results are discussed and interpreted.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 125-141
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and spectral studies of some N-[(E)-phenylmethylidene]benzenesulfonamides
    Autorzy:
    Sekar, K. G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412358.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    N-[(E)-phenylmethylidene]benzenesulfonamides
    SiO2-H3PO4
    Greener synthesis
    Hammett correlations
    Opis:
    A series of some N-[(E)-phenylmethylidene]benzenesulfonamide derivatives have been synthesised using solid SiO2-H3PO4 catalyst under solvent free conditions in microwave irradiation. The synthesised E-N-benzene sulfonilimines purities have been verified by their physical constants and spectroscopic data. The spectral frequencies are correlated with Hammett substituent constants, F and R parameters using linear regression analysis. From the results of statistical analysis the effect of substituents on the group frequencies will be discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 3; 249-258
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aryl Chalcones as Efficient Precursors for Deriving Oxazine: Solvent-free Synthesis and Antimicrobial Activities of some Oxazine-2-amines
    Autorzy:
    Thirunarayanan, G.
    Sundararajan, R.
    Arulkumaran, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411627.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxazine amines
    Chalcones
    fly-ash
    H2SO4
    Environmentally benign reaction
    antimicrobial activities
    Opis:
    A series of some oxazine derivatives has been synthesised by fly-ash:H2SO4 catalyzed solvent-free cyclization of aryl chalcones and urea under microwave irradiation. The yields of the oxazines were more than 85 %. The synthesised oxazines were characterized by their physical constants, analytical and spectroscopic data. The antimicrobial activities of these oxazines have been studied using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 4; 82-97
    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:
    Solvent-free synthesis and spectral linearity of some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H cyclopenta[b]thiophene-3-carboxamides
    Autorzy:
    Thirunarayanan, G.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412418.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Solvent-free condensation
    SiO2-H3PO4
    Imine-carboximido derivatives
    IR and NMR spectra
    Hammett correlations
    Opis:
    Some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta[b]thiophene-3-carboxamide derivatives have been synthesized by SiO2:H3PO4 catalyzed solvent-free condensation of 2-amino-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta [b]thiophene-3-carboxamide and various substituted benzaldehydes in microwave irradiation. The yield of the imine-carboximido derivatives has been found to be more than 85 %. The purity of all imine-carboximido derivatives has been checked using their physical constants and spectral data. The spectral data of the imine-carboximido derivatives such as infrared ? (cm-1) of CO, NH, C-N, C-Cl, C-F, C=N, and the NMR chemical shifts (?, ppm) of NH, CH, CO and C=N have been correlated with Hammett substituent constants, F and R parameters. From the results of statistical analysis, the effects of substituent on the above spectral group absorptions have been discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 2; 160-174
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The chemistry and synthesis of 1H-indole-2,3-dione (Isatin) and its derivatives
    Autorzy:
    Sonawane, R.P.
    Tripathi, R.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411536.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    indole
    isatin
    NBS-DMSO
    Pfitzinger reaction
    5-nitro-1H-indole-2,3-dione
    2-methylquinoline-4-carboxylic acid
    Opis:
    Isatins are synthetically versatile substrates, where they can be used for the synthesis of a large variety of heterocyclic compounds. In this, a convenient method has been developed for the conversion of Indoles into Isatins and some heterocyclic derivative were synthesised such as 5- nitro-1H-indole-2,3-dione, 2-methylquinoline-4-carboxylic acid which may be used as raw material for drug synthesis. The general process utilizes the effective method for synthesis of Isatin from Indole is bromination and oxidation with an N-bromosuccinimide-dimethyl sulfoxide reagent. The nitration of Isatin at C-5 takes place by using KNO3, conc. H2SO4, 2-methylquinoline-4-caboxylic acid are usually obtained from pfitzinger reaction.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 30-36
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pharmacological and insect antifeedant activities of some 3-(2,4-dichloro-5-fluorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides
    Autorzy:
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412405.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Halo aryl 4,5-dihydro-1H-pyrazole-1-carbothioamides
    antibacterial activity
    antifungal activity
    antioxidant activity
    insect antifeedant activity
    Opis:
    A series containing twelve titled compounds were synthesized by solvent-free method and their purities were examined by literature procedure. These compounds were subjected to study the pharmacological effects such as antibacterial, antifungal and antioxidant activities and the insect antifeedant activities using Bauer-Kirby disc diffusion method with their bacterial and fungal strains, DPPH radical scavenging and leaf disc bio-assay method with 4th instar larvae Achoea janata L.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 18; 47-56
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple and Efficient Three Component One-pot Synthesis of Pyrazolo[1,5,a]pyrimidines
    Autorzy:
    Morabia, A. R.
    Naliapara, Y. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/411804.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Pyrazolopyrimidine
    5-amino-N-cyclohexyl-3-(methylthio)-1H-pyrazole-4-carboxamide
    1-(2-bromophenyl)-2-nitroethanone
    mild reaction condition
    Opis:
    A series of novel 5-(2-bromophenyl)-N-cyclohexyl-2-(methylthio)-6-nitro-7-phenyl-4,7-dihydropyrazolo[1,5-a]pyrimidine-3-carboxamides were synthesized by a one-pot reaction of 5-amino-N-cyclohexyl-3-(methylthio)-1H-pyrazole-4-carboxamide, 1-(2-bromophenyl)-2-nitroethanone and aryl aldehydes in the presence of boric acid in water at refluxing temperature. Structures of compounds were demonstrated by Fourier transform infrared, 1H NMR, 13C NMR and elemental analysis. The advantages of this method are mild reaction condition, good yields, and operational simplicity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 41; 73-81
    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:
    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
      Wyświetlanie 1-11 z 11

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