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1
Content available Insect antifeedant potent halogen substituted phenyl chalcones
100%
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.
2
Content available Infrared and NMR spectral Hammett correlations in 4-(2-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines
100%
Thirunarayanan G. , Pazhamalai S. , Sekar K. G.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 8
38--46
EN
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.
3
Content available Synthesis, spectral (FT-IR, 1H and 13C NMR) and antimicrobial studies some of (E)-2-(2-((aryl)(phenyl)methylene)hydrazinyl)benzo[d] thiazole
100%
Manikandan S. , Thirunarayanan G.
World Scientific News
|
2018
|
tom 103
1-18
EN
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.
4
Content available Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones
100%
Thirunarayanan G. , Kumar N. D.
World Scientific News
|
2017
|
tom 74
251-266
EN
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.
5
Content available Synthesis and Hammett spectral correlation studies of some substituted cyanopyridine compounds
100%
Arulkumaran R. , Manikandan V. , Thirunarayanan G.
World Scientific News
|
2017
|
tom 80
239-255
EN
About ten substituted cyanopyridine compounds have been synthesized and the purities of these pyridines were examined with their physical constants, analytical and spectroscopic data provided in the literature. They are characteristic infrared stretches and NMR chemical shifts were assigned and they are correlated with Hammett substituent constants using single and multi-linear regression analysis. From the results, the effect of substituents on the spectral data of cyanopyridine has been discussed.
6
Content available remote Fly-ash:H2O Assisted Aldol Condensation: Effect of Solvents on the Synthesis of Some Aryl (E) 2-propen-1-ones
100%
Thirunarayanan G.
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
|
2012
|
tom 67
|
nr 1-2
79-121
EN
Some series of aryl (E) 2-propen-1-ones have been synthesized by Fly-ash:H2O catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes at reflux condition in atmospheric pressure. The yields of chalcones are higher than 60%. These chalcones were characterized by their physical constants and spectral data, for known compounds their purities were checked with the physical constants and spectral data earlier published in the literature. The effects of solvents on the product have been studied.
7
Content available 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
93-110
EN
About ten substituted (E)-1-Benzylidene-2-(diphenylmethylene) hydrazine compounds have been synthesized. They are characterized by their analytical, ultraviolet, infrared and NMR spectral data. From infrared spectra, the CN and N+N vibrational frequencies (cm-1) of the hydrazines have been assigned. From NMR spectra, the chemical shifts (, ppm) of CH proton and C(C6H5)2 carbons of the hydrazines have been assigned. These data are 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 substituents on the spectral data have been discussed.
8
Content available Effect of substituents on 4-(substituted phenyl sulfonamide)benzoic acids by IR and NMR spectra
100%
Muthuvel I. , Thirunarayanan G. , Dineshkumar S.
World Scientific News
|
2019
|
tom 128
|
nr 2
216-233
EN
About nine 4-(substituted phenyl sulfonamide) benzoic acid derivatives were synthesized by ultrasound irradiation method. The synthesized sulfonamides were characterized by their physical constants and spectroscopic data. The characteristic infrared SOsym, SOasym, NH and CO vibrations (ν, cm-1), the chemical shifts (δ, ppm) of NH and CO of sulfonamides were assigned and correlated with various Hammett substituent constants and Swain-Lupton parameters using single and multi-regression analysis. From the results of the statistical analysis, the effects of substituents on the spectral frequencies were discussed.
9
Content available IR & NMR spectral studies of some 7-substituted 9H-fluorenacyl bromides: Assessment of substituent effects
100%
Thirunarayanan G.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 9, iss. 2
152-161
EN
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.
10
Content available Greener synthesis and Hammett spectral Linearity’s of some 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines
100%
Thirunarayanan G. , Rajarajan M. , Sekar K. G. , Sathiyendiran V.
World Scientific News
|
2017
|
tom 74
164-180
EN
We have synthesized eleven numbers of 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines by hydroxyapatite catalyzed microwave assisted condensation method. The synthesized 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazine compounds were characterized by means of their IR and NMR spectral data. The assigned infrared spectral νC=N, νC-O-C stretches(cm-1), NMR chemical shifts of isoxazoline (d) proton, isoxazoline (m) proton, N-CH3, C=N, C-NH2 and C-NH3 (δ, ppm) of these 1-{[3-(furan-2-yl)-5-phenyl-4,5-dihydro-1,2-oxazol-4-yl]methyl}-4-methyl piperazines 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.
11
Content available Spectral LFER studies in some N-(substituted phenyl) formamides
88%
Thirunarayanan G. , Muthuvel I. , Sathiyendiran V.
|
|
tom 70
|
nr 2
EN
A series of N-(substituted phenyl) formamides were synthesised by sulphated titania (TiO2-SO4 2-) catalyzed formylation of substituted anilines and formic acid in acetonitrile medium at room temperature. The synthesised formamide derivatives are characterized by their spectral data. The infrared νNH, CO (cm-1) stretches, chemical shifts(δ, ppm) of NH, COH and ipso carbons(Ar-C-NH) were assigned and correlated with Hammett substituent constants using single and multi-regression analysis. From the results of statistical analyses, the effect of substituents on the spectral data have been studied.
12
Content available Synthesis, assessment of substituent effect and antimicrobial activities of some substituted (E)-Nbenzylidene- 5-bromopyridin-2-amines
88%
Senbagam R. , Vanangamudi G. , Thirunarayanan G.
|
|
tom 70
|
nr 2
EN
A series of substituted (E)-N-benzylidene-5-bromopyridin-2-amine compounds have been synthesized from 5-bromo-2-aminopyridine with different substituted benzaldehydes. The structure of the adducts was confirmed by their physical constants, UV, IR and NMR spectral data. The observed UV absorption maximum λmaxC=N(nm), IR frequencies νC=N(cm-1), The 1H and 13C NMR δ(ppm) chemical shifts values 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 spectral data has been studied. The antimicrobial activities of all synthesized imines have been studied using Bauer-Kirby method.
13
Content available Solvent-free synthesis and spectral linearity of some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H cyclopenta[b]thiophene-3-carboxamides
88%
Thirunarayanan G. , Sekar K. G.
International Letters of Chemistry, Physics and Astronomy
|
2013
|
tom Vol. 8, iss. 2
160-174
EN
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.
14
Content available Spectral correlations and antimicrobial activities of some (E)-N-Benzylidenepyridin-2-amines
88%
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.
15
Content available remote Quantum chemical computational studies on bis-thiourea zinc acetate
88%
Pir H. , Günay N. , Tamer O. , Avci D. , Tarcan E. , Atalay Y.
Materials Science Poland
|
2013
|
tom Vol. 31, No. 3
357--371
EN
In this study, quantum chemical calculations of vibrational spectra, Raman spectra, electronic properties (total energy, dipole moment, electronegativity, chemical hardness and softness), Mulliken atomic charges and thermodynamic parameters of bis-thiourea zinc acetate (BTZA) have been performed using Gaussian 09 program. Additionally, nonlinear optical (NLO), conformational, natural bond orbital (NBO) analyses of BTZA have been carried out using the same program. The structural and spectroscopic data of the molecule in the ground state have been calculated using Hartree-Fock (HF) and density functional method (DFT/B3LYP) with the 6-311++G(d,p) basis set. In addition, the molecular frontier orbital energies (HOMO, HOMO-1, LUMO and LUMO+1) of the title compound have been calculated at the HF and B3LYP levels. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. Finally, the calculated results were applied to simulate infrared and Raman spectra of the title compound which showed good agreement with the experimental ones.
16
Content available Insect antifeedant potent unsaturated 1,3-oxazine-2-amines
75%
Thirunarayanan G. , Renuka V. , Sekar K. G. , Lakshmanan K. , Anbarasu K.
International Letters of Chemistry, Physics and Astronomy
|
2014
|
tom Vol. 4
66--81
EN
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.
17
Content available Spectral Quantitative Structure activity relationships in 3-(substituted phenyl) bicyclo[2.2.1]hept-5-en-2-yl-(pyrene-1-yl) methanone derivatives
75%
Thirunarayanan G.
World Scientific News
|
2016
|
tom 50
74-94
EN
About nine titled compounds were synthesized by greener method and the purities of these methanones have been examined using their analytical and spectral data reported in literature. The infrared and NMR spectral data of these methanones 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 in terms of spectral quantitative structure activity on the spectral frequencies were studied.
18
Content available QSAR study of infrared and nuclear magnetic resonance spectra of 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines
75%
Ananthi V. , Rajalakshmi K. , Thiruarayanan G.
World Scientific News
|
2017
|
tom 70
|
nr 2
122-139
EN
Ten 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines have been synthesized by FeCl3/Bentonite catalyzed solvent-free condensation of substituted phenyl hydrazine and aldehydes under microwave irradiation. The synthesized hydrazides are characterized by the physical constants, micro analysis and spectroscopic data. The assigned characteristic spectroscopic data of these 1-(3-chloro-4-nitrophenyl)-2-(substituted benzylidene) hydrazines were correlated with Hammett substituent constants, F and R parameters using Hammett equation through single and multi-regression analysis. With the results of statistical analysis results, the quantitative structure activity relationships were studied and finding the effect of substituents on the spectral data.
19
Content available Synthesis, Assessment of substituent effect and Antimicrobial activities of some substituted (E)-N-benzylidene-4H-1,2,4-triazol-4-amines
75%
Senbagam R. , Rajarajan M. , Vijayakumar R. , Manikandan V. , Balaji S. , Vanangamudi G. , Thirunarayanan G.
World Scientific News
|
2015
|
tom 8
176-191
EN
Schiff H., Justus Liebigs Annalen der Chemie. 131(1) (1864) 118-9. [2] Lau K. Y., Mayr A., Cheung K. K., Inorgnic Chimica Acta. 285 (1999) 223-232. [3] Shawali A. S., Harb N. M. S., Badahdah K. O., Journal of Heterocyclic Chemistry. 22 (1985) 1397-1403. [4] Gupta K. C., Sutar A. K., Coordination Chemistry Review. 252 (2008) 1420-1450. [5] Yuan M., Zhao F., Zhang W., Wang Z. M., Gao S., Inorgnic Chemistry. 46 (2007) 11235-42. [6] Nakaic T., Meddu S., Kurahashi T., Japan Patent. 7389932 (1973); Chemical Abstracts. 81(1974) 65182. [7] Quraishi Harion M. A., Sharma K., Journal of Materials Chemistry and Physics. 78 (2002) 18-21. [8] Ramesh S., Rajeshwari S., Elctrochimica Acta. 49 (2004) 811-820. [9] Colter R. J., Matzner M., Ring terming poly, Part B-1, ‘Heterocyclic Ring’ Academic, New Youk, (1972). [10] Popp. F. D., Journal of Organic Chemistry. 26 (1961) 1566-1568. [11] Rao X., Huang X., He L., Song J., Song Z., Shang S., Combinatorial Chemistry & High Throughput Screening. 15 (2012) 840-844. [12] Hadjipavlou-litina D. J., Geronikaki A. A., Letters in Drug Design & Discovery. 15 (1996) 199-206. [13] Tiwary M., Naik S. N., Tiwari D. K., Mittal P. K., Yadav S., Journal of vector Brone Diseases. 44 (2007) 198-204. [14] Solak N., Rollas S., Arkivoc. (2006) 173-181. [15] Wadher S. J., Puranik M. P., Karande N. A., Yeole P. G., International Journal of Pharm Tech Research 1 (2009) 22-33. [16] Cates A. L., Rasheed S. M., Pharmaceutical Research 6 (1984) 271-273. [17] Sakthinathan S. P., Suresh R., Mala V., Sathiyamoorthi K., Kamalakkannan D., Ranganathan K., John Joseph S., Vanangamudi G., Thirunarayanan G., International Journal of Scientific Research and Knowledge, 1(11) (2013) 472. [18] 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. 6 (2013) 77. [19] Suresh R., Kamalakkannan D., Ranganathan K., Arulkumaran R., Sundararajan R., Sakthinathan S. P., Vijayakumar S., Sathiyamoorthi K., Mala V., Vanangamudi G., Thirumurthy K., Mayavel P., Thirunarayanan G., Spectrochim. Acta, 101A (2013) 239. [20] Arulkumaran R., Vijayakumar S., Sakthinathan S.P., Kamalakkannan D., Ranganathan K., Suresh R., Sundararajan R., Vanangamudi G., Thirunarayanan G., Journal of Chilean Chemical Society. 2 (2013) 58. [21] Thirunarayanan G., Gopalakrishnan M., Vanangamudi G., Spectrochemica Acta 67A (2007)1106-1112 [22] Swain C. G., Lupton E. C., Journal of American Chemical Society. 90 (1968) 4328-4337. [23] Bauer A. W., Kirby W. M. M., Sherris J. C., Truck M., American Journal of Clinical Pathology. 45 (1966) 493-498.
20
Content available Ultrasonicated Synthesis of Bio-potent Sulphonamides
75%
Thirunarayanan G.
World Scientific News
|
2019
|
tom 119
125-138
EN
About more than 85% yields of some aryl sulphonamides were synthesised by sodium acetate catalysed ultrasonication promoted condensation of aryl amines and benzene sulfonyl chlorides in room temperature. The synthesised sulfonamides were analysed with their physical constants, micro analysis and spectral techniques. The antioxidant potential of these sulfonamides were assessed by DPPH radical scavenging activity measurement using L-ascorbic acid as a standard. Antimicrobial activities of these sulfonamides have been assessed by disc diffusion method against their antimicrobial stains. Most of the sulfonamides shows antimicrobial activity. Many of the hydroxy and methoxy substituted sulfonamides showed significant antioxidant activity.
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