Temat: hammett equation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Skocz do pozycji: 2.

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

Skocz do pozycji: 3.

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

Skocz do pozycji: 4.

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

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