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Wyświetlanie 1-15 z 45
Tytuł:
Structure parameter correlation of some quinoxaline derivatives through IR and 13C NMR spectra
Autorzy:
Thirunarayanan, G.
Muthuvel, I.
Sathiyendiran, V.
Powiązania:
https://bibliotekanauki.pl/articles/412003.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Quinoxalines
IR spectra
NMR spectra
Hammett Correlation
substituent effects
Opis:
A series of 6-substituted quanoxaline derivatives have been synthesized and examined their purities by literature method. The infrared and 13>/Sup>C NMR spectral data of these quinoxalines were correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the results of statistical analysis, the effect of substituents on the spectral frequencies has been studied.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 198-207
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of substituent effects on β-naphthyl based isoxazoles by IR and NMR spectra
Autorzy:
Thirunarayanan, G.
Sathiyendiran, V.
Arulkumarn, R.
Sundararrajan, R.
Manikandan, R.
Vanangamud, G.
Powiązania:
https://bibliotekanauki.pl/articles/1194022.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Correlation analysis
IR spectra
NMR spectra
β-naphthyl dihydroisoxazoles
Opis:
A series containing thirteen 3-(2-naphthyl)-5-(substituted phenyl)-4,5-dihydroisoxazole have been synthesized and examined their purities by their data reported earlier. The characteristic infrared νC=N (cm-1) stretches, NMR chemical shifts (δ, ppm) of H4,4׳, H5 protons, C3-5 carbons were assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi- regression analysis. From the results of regression analysis the effect of substituents on the spectral data have been studied.
Źródło:
World Scientific News; 2015, 9; 35-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hammett spectral correlations in benzofuranyl flavonols
Autorzy:
Thirunarayanan, G.
Sekar, K. G.
Powiązania:
https://bibliotekanauki.pl/articles/412326.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Benzofuranyl flavonols
Hammett equation
IR spectra
NMR spectra
Regression analysis
Opis:
A series containing eleven benzofuranyl flavonols have been prepared by cyclization of 3-hydroxybenzofuranyl chalcones with 30 % hydrogen peroxide in the presence of sodium bicarbonate. The synthesized flavonols were characterized by their physical constants, analytical and spectroscopic data. The infrared spectral νOH, CO stretches(cm-1), NMR chemical shifts of OH, CO(δ, ppm) of these flavonols 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:
International Letters of Chemistry, Physics and Astronomy; 2014, 6; 39-47
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral studies and antimicrobial activities of some substituted (E)-1-benzylidene-2-(4-bromophenyl)hydrazines
Autorzy:
Rajarajan, M.
Senbagam, R.
Vijayakumar, R.
Manikandan, V.
Balaji, S.
Vanangamudi, G.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1194024.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial study
Hammett equation
Hydrazone
IR spectra
NMR spectra
Synthesis
UV
Opis:
A series of nine number of (E)-1-benzylidene-2-(4-bromophenyl)hydrazine compounds have been synthesized by the condensation reaction of 4-bromo phenylhydrazine with varies m- and p- substituted benzaldehydes using acetic acid catalyst were refluxed for 4h with 20 mL of absolute ethanol. The yield of synthesized (E)-1-benzylidene-2-(4-bromophenyl)hydrazine compounds are more than 80%. The synthesized (E)-1-benzylidene-2-(4-bromophenyl)hydrazines have been characterized by UV, IR, 1H and 13C spectral data. These UV, IR and NMR spectral data have been correlated with varies Hammett substituted constant and Swain-Lupton F and R parameters using single and multi- regression analysis. From the results of statistical analysis, the effects of substituent have been studied. The antimicrobial activity of all the synthesized substituted (E)-1-benzylidene-2-(4-bromophenyl)hydrazines have been evaluated using Bayer-Kirby method.
Źródło:
World Scientific News; 2015, 9; 144-160
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral studies of some (5-substituted phenyl) isoxazole based sydnones: Assessment of substituent effects
Autorzy:
Thirunarayanan, G.
Vanangamudi, G.
Sathiyendiran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1194034.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Hammett substituent constants
IR spectra
NMR spectra
Spectral LFER
Sydnone isoxazole
Opis:
About ten 4-(N-(4-(5-phenylisoxazol-3-yl)phenylsufamyl)-3-(p-tolyl)-1,2,3,-oxadiazol-3-ium-5-olates were synthesised and examined their purities by literature method. The infrared and NMR spectral data of above synthesised isoxazoles were assigned and correlated with Hammett substituent constants and Swain-Lupton’s constants using regression analysis. From statistical analyses results, the effects of substituents on the spectral data have been discussed.
Źródło:
World Scientific News; 2015, 11; 44-64
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral correlations and biological activities of some (E)-[4-(substituted benzylidene amino)phenyl] (phenyl) methanones
Autorzy:
Mayavel, P.
Thirumurthy, K.
Dineshkumar, S.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/412136.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Schiff's bases
fly-ash
PTS
IR spectra
NMR spectra
Hammett correlation
Opis:
A series of Schiff’s bases have been synthesized by fly-ash:p-toluenesulfonic acid (fly-ash:PTS) catalyzed microwave assisted oxidative coupling of arylamines and substituted benzaldehydes under solvent-free condition. The synthesized Schiff’s bases are characterized by their physical constants, analytical and spectroscopic data. The group frequencies of imines such as IR (v, cm–1) and NMR (δ, ppm) spectral data was correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. The antimicrobial activities of these Schiff’s bases have been studied using Bauer-Kirby method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 2; 145-159
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:
Spectral LFER in some aryl azine derivatives
Autorzy:
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1191375.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aryl hydrazines
Hammett correlations
IR spectra
NMR spectra
Swain-Lupton’s parameters
Opis:
About ten (Z)-1-(1-(substitutedphenyl)ethylidene)-2-(diphenylmethylene)hydrazines were prepared and their purities were examined by literature method. The infrared and NMR spectra of these hydrazines were recorded. The characteristics C=N and N-N stretches (ν, cm-1) and the chemical shifts (δ, ppm) of methyl protons and carbons were assigned. These spectral have been correlated with Hammett substituent constants, F, R and Swain-Lupton’s parameters using single and multi-regression analysis. From the results of statistical analyses, the effects of substituent on the spectral data have been studied.
Źródło:
World Scientific News; 2016, 33; 79-95
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, spectral (FT-IR, 1H and 13C NMR) and antimicrobial studies some of (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d] thiazole
Autorzy:
Manikandan, S.
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1177421.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Aryl hydrazone
IR and NMR spectra
antibacterial and antifungal activities
Opis:
A series of (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d] thiazole compounds by condensation of substituted benzophenone with 2-hydrazinobenzothizol in the presence acetic acid. The synthesized compounds 1-6 were characterized by elemental, FT-IR, 1H and 13C NMR spectral data. From the IR and NMR spectra, the characteristic frequencies were assigned and the data used for confirmation of the formation hydrazones 1-6. All compounds were screened for their preliminary antibacterial and antifungal activities. The methoxy substituted compound 6 shows good antibacterial activity against their bacterial strains within the agreed mm of zone of inhibition. The methyl (5) and methoxy (6) substituted hydrazones show good antifungal activities against their fungal strains.
Źródło:
World Scientific News; 2018, 103; 1-18
2392-2192
Pojawia się w:
World Scientific News
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:
Infrared and ¹³C NMR spectral studies of some aryl hydrazides: Assessment of substituent effects
Autorzy:
Thirunarayanan, G.
Sekar, G. K.
Lakshmi Narayanan, R.
Powiązania:
https://bibliotekanauki.pl/articles/412577.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
substituted aryl benzohydrazide
IR spectra
NMR spectra
hammett equation
substituent constants
correlation analysis
Opis:
A series of some aryl hydrazides have been synthesized. These hydrazides purities were analyzed by physical constants and spectral data. The assigned spectral group frequencies were correlated with Hammett substituent constants and Swain-Lupton parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies has been discussed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 88-94
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:
Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones
Autorzy:
Thirunarayanan, G.
Kumar, N. Dinesh
Powiązania:
https://bibliotekanauki.pl/articles/1179609.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antimicrobial activities
Aryl chalcones
Cu2+/Zeolite
IR and NMR spectra
Opis:
Some aryl chalcones have been synthesized by Cu2+/Zeolite catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes under microwave irradiation conditions. The yields of the synthesized chalcones are more than 85%. These chalcones were characterized by their physical constants and spectroscopic data. The antimicrobial activities of synthesized chalcones were studied by Bauer-Kirby disc diffusion method.
Źródło:
World Scientific News; 2017, 74; 251-266
2392-2192
Pojawia się w:
World Scientific News
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:
Synthesis and spectral correlation study of some 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones
Autorzy:
Thirunarayanan, G.
Ravi, K.
Powiązania:
https://bibliotekanauki.pl/articles/412390.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Solvent-free cyclization cum acetylation
N-acetyl pyrazoles
IR spectra
NMR spectra
Hammett correlations
Opis:
Some N-acetyl pyrazoles including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones including substituted styryl 3,4-dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash: H2SO4 catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75 %. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data. The infrared spectral νC=N and C=O (cm-1) frequencies, NMR chemical shifts (δ, ppm) of Ha, Hb, Hc, CH3 protons, C=N, C=O and CH3 carbons of 1-(3-(3,4-dichlorophenyl)-5-(substitutedphenyl)-4,5-dihydro-1H-pyrazole-1-yl) ethanones have been assigned and correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi-regression analysis. From the results of statistical analyses the effect of substituents on the above group frequencies and chemical shifts of the acetylated pyrazoles were discussed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 44-57
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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