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Wyszukujesz frazę "Oxazine" wg kryterium: Temat

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Infrared Studies and Mineral Element Analysis of the leaf of Vernonia amygdalina
    Autorzy:
    Duru, Ijeoma Akunna
    Duru, Chidi Edbert
    Powiązania:
    https://bibliotekanauki.pl/articles/1113770.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aliphatic esters
    Elemental analysis
    Infrared
    Oxazine
    Secondary amines
    V. amygdalina
    Opis:
    Used in traditional medicine, infrared characterization of column eluates and elemental analysis of V. amygdalina was carried out to establish preliminary views of the chemical and mineral element composition of the leaf of this plant. In the five pure eluates obtained, we found that they contained saturated aliphatic esters, nitro-groups conjugated with benzene ring, secondary amines/nitrogen heterocycles, 1,3-disubstituted benzene and oxazine/oxazoline fragments, respectively. Moreover, we established that potassium, magnesium and sodium were the major minerals in the leaf, while copper, zinc, iron, nickel, manganese and chromium occurred in trace amounts. Research attention should therefore be focused on this plant for the full exploration and exploitation of its obvious antibiotic and mineral values.
    Źródło:
    World News of Natural Sciences; 2017, 13; 1-9
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of some new Schiff bases of 2-oxonaphtho[2,1-b][1,4]oxazine
    Autorzy:
    Chovatiya, P.
    Mehta, C.
    Senjani, H.
    Shah, A.
    Joshi, H. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/411737.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    2-Oxonaphtho[2,1-b][1,4]oxazine
    Schiff base
    Opis:
    The literature review reveal that [1,4]-oxazine derivatives represent one of the most active classes of compounds possessing wide spectrum of biodynamic activities and use as potent therapeutic agents. In the present work, a series of Schiff base of 2-(2,3-dihydro-2-oxonaphtho[2,1-b][1,4]oxazin-1-yl)acetohydrazide, 5a-5j has been synthesized using 1-aminonaphthalen-2-ol. Various aromatic aldehyde were react with carbohydrazide 4 in the presence of acid to produce the 2-oxonaphtho[2,1-b][1,4]oxazin Schiff base derivatives with good yields. All synthesized compounds were characterized by IR, NMR and Mass spectrometry analysis.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 12; 26-30
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    IR and NMR spectral studies of some 4-(6-methoxy-2-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines: Assessment of substituent effects
    Autorzy:
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412242.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxazine-2-amines
    IR spectra
    NMR spectra
    Hammett correlation
    Substituent constans
    Opis:
    A series containing thirteen title compounds were synthesized and recorded IR and NMR spectra. The infrared νNH, C=N(cm-1)stretches, 1H NMR δNH, 13C NMR δC=N(ppm) chemical shifts of synthesized oxazine amines were assigned and correlated with Hammett substituent constants, F and R parameters. From the results of statistical analyses, the effect of substituents on the above spectral frequencies can be discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 4; 109-116
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    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:
    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:
    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:
    Determining Ultraviolet Degradation of High-Visibility Warning Clothing With Photochromic Indicators
    Autorzy:
    Pościk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/91085.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    photochromic indicators
    UV degradation
    warning clothing
    oxazine
    diarylethene
    praca na powietrzu
    odzież ostrzegawcza
    promieniowanie nadfioletowe
    starzenie się materiału
    reakcje fotochemiczne
    Opis:
    The main purpose of this study was to select an appropriate photochromic dye and to develop a series of photochromic indicators showing ultraviolet (UV) degradation of selected background materials made from different polymers. The photochemistry of a series of photochromic compounds of oxazine and diarylethenes in thin polystyrene films were studied with spectroscopic methods. This paper also discusses the design and results of tests of UV photochromic indicators for high-visibility clothing.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 79-86
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insect antifeedant potent unsaturated 1,3-oxazine-2-amines
    Autorzy:
    Thirunarayanan, G.
    Renuka, V.
    Sekar, K.G.
    Lakshmanan, K.
    Anbarasu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/412312.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Insect antifeedant activity
    4th instar larvae Achoea Janata L
    Aryl 1,3-oxazine
    Castor leaf discs
    Green synthesis
    IR and NMR spectra
    Opis:
    Insect antifeedant activities of some halo substituted aryl 1,3-oxazine-2-amines have been measured using 4th instar larvae Achoea Janata L by castor leaf discs-Dethler’s method. The highly halo substituted oxazine amines have shown good insect antifeedant activities. The 1,3-oxazine amines have been synthesised by greener method by solvent-free cyclization of aryl enones with urea under microwave irradiation. The yields of the oxazines were more than 80 %. The synthesised oxazines were characterized by their physical constants, analytical and spectroscopic data.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 4; 66-81
    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
      Wyświetlanie 1-9 z 9

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