PL
 |
EN
Ten serwis zostanie wyłączony 2025-02-11.
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 18

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Synthesis and spectral correlation studies of some substituted (E)-1-Benzylidene-2-(diphenylmethylene) hydrazines
100%
Arulkumaran R. , Manikandan V. , Christuraj P. , Thirunarayanan G.
World Scientific News
|
2017
|
tom 62
2
Content available Aryl Chalcones as Efficient Precursors for Deriving Oxazine: Solvent-free Synthesis and Antimicrobial Activities of some Oxazine-2-amines
100%
Thirunarayanan G. , Sundararajan R. , Arulkumaran R.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 4
82--97
EN
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.
3
Synthesis and Hammett spectral correlation studies of some substituted cyanopyridine compounds
100%
Arulkumaran R. , Manikandan V. , Thirunarayanan G.
World Scientific News
|
2017
|
tom 80
4
Hammett spectral LFER of some antioxidant substituted benzylidene hydrazines
88%
Thirunarayanan G. , Manikandan V. , Arulkumaran R. , Rajarajan M. , Sathiyendiran V.
World Scientific News
|
2017
|
tom 69
5
Content available IR and 1H NMR spectral studies of some 2-Amino-4-isopropyl-6-methoxy-N-phenylpyrimidine-5-carboxamides: Assessment of substituent effects
75%
Arulkumaran R. , Sundararajan R. , Manikandan V. , Sathiyendiran V. , Pazhamalai S. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 19, iss. 1
15--25
EN
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.
6
Infrared and 13C NMR spectral correlation analysis of some substituted oxazepin based ketone and thione derivatives with Hammett constant
75%
Sathiyamoorthi K. , Kamalakkannan D. , Suresh R. , Sakthinathan S. P. , Arulkumaran R. , Sundararajan R. , Thirunarayanan G.
World Scientific News
|
2016
|
tom 58
7
Synthesis and Hammett spectral QSAR analysis of some (E)–1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
75%
Vijayakumar S. , Manikandan F. , Arulkumaran R. , Christuraj P. , Sundararajan R. , Thirunarayanan G.
World Scientific News
|
2019
|
tom 115
8
Content available Insect antifeedant potent halogen substituted phenyl chalcones
63%
Sundararajan R. , Arulkumaran R. , Vijayakumar S. , Kamalakkannan D. , Suresh R. , John J. S. , Ranganathan K. , Sakthinathan S. P. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 1
67-73
EN
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.
9
Synthesis and spectral correlation studies of some (E)-N′-1-(substituted benzylidene) benzohydrazides
63%
Manikandan V. , Balaji S. , Senbagam R. , Vijayakumar R. , Rajarajan M. , Vanangamudi G. , Arulkumaran R. , Sundararajan R. , Thirunarayanan G.
World Scientific News
|
2018
|
tom 111
10
Content available Spectral correlations in some substituted styryl (E)-4-((2-oxopropyl) diazenyl) benzoic acids
63%
Sathiyendiran V. , Sekar K. G. , Thirunarayanan G. , Arulkumaran R. , Sundararajan R. , Kamalakkannan D. , Suresh R. , Manikanadan V. , Vijayakumar R. , Vanangamudi G.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 11, iss. 1
33-43
EN
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.
11
Correlation analysis of substituted 2-((phenyl amino)methyl)-1,2-dihydro-5-(3-methoxyphenyl)-1-phenyl-1,2,4-triazole-3-thiones
63%
Thirunarayanan G. , Kamalkkannan D. , Suresh R. , Sakthinathan S. P. , Sundararajan R. , Arulkumaran R. , Manikandan R. , Vanangamudi G. , Sathiyendiran V.
|
2015
|
tom 12
12
Content available Electrochemical reduction potential correlation of some insect antifeedant potent 2-phenothiazinyl chalcones
63%
Ranganathan K. , Suresh R. , Kamalakkannan D. , Arulkumaran R. , Sundararajan R. , Sakthinathan S. P. , Vijayakumar S. , Thirumurthy K. , Mayavel P. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2012
|
tom Vol. 4
66-75
EN
A series containing twelve substituted styryl 2-phenothiazenyl ketones have been synthesized. The electrochemical potentials of carbonyl and vinyl groups were measured. These potentials are correlated with Hammett substituent constants, F and R parameters. From the results of statistical analyses, the effects of substituent on the group reduction potentials have been discussed. The insect antifeedant activities of these chalcones have been studied using 4th instar larvae Achoea Janata L with castor leaf discs.
13
Content available Thionylchloride catalyzed aldol condensation: Synthesis, spectral correlation and antibacterial activities of some 3,5-dichloro-2-hydroxyphenyl chalcones
63%
Arulkumaran R. , Vijayakumar S. , Sundararajan R. , Sakthinathan S. P. , Kamalakkannan D. , Suresh R. , Ranganathan K. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2012
|
tom Vol. 4
17-38
EN
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.
14
Content available Spectral correlations and antimicrobial activities of some 1-pyrenyl chalcones
63%
Arulkumaran R. , Vijayakumar S. , Sundararajan R. , Sakthinathan S. P. , Kamalakkannan D. , Suresh R. , Ranganathan K. , Rajakumar P. R.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 5
21-38
EN
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.
15
Content available Spectral correlation analysis and antimicrobial activities of some 2,4-dimethoxy phenyl chalcones
51%
Joseph S. J. , Arulkumaran R. , Kamalakkannan D. , Sakthinathan S. P. , Sundararajan R. , Suresh R. , Vijayakumar S. , Ranganathan K. , Kalyanasundaram N. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 4
48--65
EN
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.
16
Content available Synthesis, spectral correlations and antimicrobial activities of some 2-hydroxyphenyl-styrylketone
51%
Sathiyamoorthi K. , Mala V. , Suresh R. , Sakthinathan S. P. , Kamalakkannan D. , Ranganathan K. , Arulkumaran R. , Sundararajan R. , Vijayakumar S. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 7, iss. 2
102--119
EN
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.
17
Content available Spectral correlations and antimicrobial activities of some (E)-N-Benzylidenepyridin-2-amines
51%
Sakthinathan S. P. , Suresh R. , Mala V. , Sathiyamoorthi K. , Kamalakkannan D. , Ranganathan K. , Arulkumaran R. , Vijayakumar S. , Sundararajan R. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 6
77-90
EN
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.
18
Content available Microwave assisted synthesis, spectral studies and antimicrobial activities of some 2′,4′-difluorophenyl chalcones
51%
Vijayakumar S. , Arulkumaran R. , Sundararajan R. , Sakthinathan S. P. , Suresh R. , Kamalakkannan D. , Ranganathan K. , Sathiyamoorthy K. , Mala V. , Vanangamudi G. , Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 9, iss. 1
68-86
EN
Some 2′,4′-difluorophenyl chalcones have been synthesized under microwave irradiation using aldol condensation between 2,4-difluoroacetophenone and substituted benzaldehydes using catalytic amount of hydroxyapatite. The yields of the chalcones are more than 85 %. The purities of these synthesized chalcones were examined by their physical constants and spectroscopic data. The UV absorption maxima (λmax, nm), infrared stretches (ν, cm-1) of CO, fingerprint region of CHip/op, CH=CHop, C=Cop modes, NMR chemical shifts (δ, ppm) of vinyl proton, carbon and carbonyl carbons have been assigned and correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the statistical analysis the effect of substituent on the above spectral frequencies can be discussed. The antimicrobial activities of these synthesized chalcones have been screened using Bauer-Kirby method.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.