scholarly journals Structure Parameter Correlation of some Quinoxaline Derivatives through IR and 13C NMR Spectra

2014 ◽  
Vol 38 ◽  
pp. 198-207 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
I. Muthuvel ◽  
V. Sathiyendiran
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Spectral Data ◽  
Nmr Spectra ◽  
Structure Parameter ◽  
Effect Of Substituents ◽  
Parameter Correlation ◽  
Quinoxaline Derivatives ◽  
Substituent Constants ◽  
C Nmr

A series of 6-substituted quanoxaline derivatives have been synthesized and examined their purities by literature method. The infrared and 13C 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.

scholarly journals Effect of Substituents on Phenazine Derivatives by Spectral Studies

2015 ◽  
Vol 48 ◽  
pp. 114-122
Author(s):  
G. Thirunarayanan ◽  
I. Muthuvel ◽  
V. Sathiyendiran
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Spectral Data ◽  
Chemical Shifts ◽  
Spectral Studies ◽  
Nmr Chemical Shifts ◽  
Effect Of Substituents ◽  
Substituent Constants ◽  
Infrared Frequencies ◽  
C Nmr

A series of eleven substituted dipyrido[3,2-a; 2′,3′-c]phenazine derivatives have been synthesized and examined their purities by literature method. The infrared and 13C NMR spectral data of prepared phenazines 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 infrared frequencies (ν, cm-1) and 13C nmr chemical shifts(δ, ppm) has been studied.

scholarly journals Spectral Correlations in some Substituted Styryl (E)-4-((2-Oxopropyl)Diazenyl) Benzoic Acids

2014 ◽  
Vol 30 ◽  
pp. 33-43
Author(s):  
V. Sathiyendiran ◽  
K.G. Sekar ◽  
Ganesamoorthy Thirunarayanan ◽  
R. Arulkumaran ◽  
R. Sundararajan ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Benzoic Acids ◽  
Effect Of Substituents ◽  
Substituent Constants ◽  
Multi Linear Regression ◽  
Spectral Group

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.

scholarly journals 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

2013 ◽  
Vol 23 ◽  
pp. 109-116
Author(s):  
Ganesamoorthy Thirunarayanan
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
Statistical Analyses ◽  
Spectral Studies ◽  
Ir And Nmr Spectra ◽  
Effect Of Substituents ◽  
H Nmr ◽  
Substituent Constants ◽  
C Nmr

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.

scholarly journals Spectral QSAR and QPR Study of some (E)-4-(((2-Hydroxy-6-(Substituted Phenyl)-1,6 Dihydropyrimidin-4-yl)Methyl)Diazenyl)Benzoic Acid Derivatives

2014 ◽  
Vol 36 ◽  
pp. 10-20
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Statistical Analysis ◽  
Benzoic Acid ◽  
Nmr Spectra ◽  
Effect Of Substituents ◽  
Benzoic Acid Derivatives ◽  
Substituent Constants ◽  
Spectral Group

A series of titled compounds were synthesized and recorded the infrared and NMR spectra. The assigned spectral group frequencies were correlated with Hammett substituent constants, F and R parameter. From the statistical analysis results, the effect of substituents on the spectral group frequencies has been studied.

scholarly journals Infrared and 13C NMR Spectral Studies of some Aryl Hydrazides: Assessment of Substituent Effects

2014 ◽  
Vol 32 ◽  
pp. 88-94 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar ◽  
R. Lakshmi Narayanan
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Substituent Effects ◽  
Spectral Studies ◽  
Substituent Constants ◽  
Multi Linear Regression ◽  
Spectral Group ◽  
C Nmr

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

scholarly journals Spectral Correlations and Antimicrobial Activities of Some (E)-N-Benzylidenepyridin-2-Amines

2013 ◽  
Vol 11 ◽  
pp. 77-90 ◽  
Author(s):  
S.P. Sakthinathan ◽  
R. Suresh ◽  
V. Mala ◽  
K. Sathiyamoorthi ◽  
D. Kamalakkannan ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Spectral Data ◽  
Oxidative Coupling ◽  
Linear Regression Analysis ◽  
Antimicrobial Activities ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
Substituent Constants ◽  
Multi Linear Regression

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 λmaxC=N(nm), infrared νC=N(cm-1), NMR δ(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.

Infrared, 1H and 13C NMR Spectral Studies of some 4-([1,1′-Biphenyl]-4-yl)-6-(Substituted Phenyl)-5,6-Dihydro-4H-1,3-Oxazine-2-Amines: Assessment of Substituent Effects

2015 ◽  
Vol 50 ◽  
pp. 9-16
Author(s):  
G. Thirunarayanan ◽  
V. Sathiyendiran ◽  
Ganesan Vanangamudi ◽  
R. Arulkumaran ◽  
V. Manikandan ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Chemical Shifts ◽  
Substituent Effects ◽  
Spectral Studies ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
Substituent Constants ◽  
Infrared Frequencies ◽  
C Nmr

About ten titled compounds were prepared by microwave assisted silica-phosphoric acid catalysed cyclization of substituted styryl 4-biphenyl ketones and urea under solvent-free conditions. The infrared frequencies (ν, cm-1) of NH2, C=N, COC stretches, NMR spectral chemical shifts (δ, ppm) of NH2, H4-6, C=N, and C4-6 were assigned and 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 infrared frequencies (ν, cm-1) and NMR chemical shifts (δ, ppm) has been studied.

scholarly journals Solvent-Free Synthesis and Spectral Linearity of Some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta[b]thiophene-3-carboxamides

2013 ◽  
Vol 13 ◽  
pp. 160-174 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Statistical Analysis ◽  
Microwave Irradiation ◽  
Spectral Data ◽  
Chemical Shifts ◽  
Solvent Free ◽  
Nmr Chemical Shifts ◽  
Substituent Constants ◽  
Substituted Benzaldehydes ◽  
Solvent Free Synthesis ◽  
Spectral Group

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 ν (cm-1) of CO, NH, C-N, C-Cl, C-F, C=N, and the NMR chemical shifts (δ, 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.

scholarly journals Synthesis and Assessment of Substituent Effect on (E)-1-(4-Fluoro-3-Methylphenyl)-3-Phenylprop-2-en-1-One Compounds

2015 ◽  
Vol 57 ◽  
pp. 145-155 ◽  
Author(s):  
S. Balaji ◽  
M. Rajarajan ◽  
R. Vijayakumar ◽  
V. Manikandan ◽  
R. Senbagam ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Linear Regression ◽  
Spectral Data ◽  
Substituent Effect ◽  
Condensation Reaction ◽  
Regression Analyses ◽  
Physical Constants ◽  
Substituent Constants ◽  
Multi Linear Regression ◽  
Substituted Benzaldehydes

In the present investigation, a series of substituted (E)-1-(4-fluoro-3-methylphenyl)-3-phenylprop-2-en-1-one compounds were synthesized by condensation reaction of 4-fluoro-3-methyl acetophenone with substituted benzaldehydes in the presence of alkali. The yields of synthesized compounds are more than 80%. The structures of all the synthesized compounds were confirmed by their physical constants, UV, IR and NMR spectral data. All the observed spectral data of substituted (E)-1-(4-fluoro-3-methylphenyl)-3-phenylprop-2-en-1-one compounds have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analyses. From the results of statistical analysis the effects of substituents have been discussed.

scholarly journals Spectral LFER Studies on Some Sydnone Chalcones

2015 ◽  
Vol 53 ◽  
pp. 41-53
Author(s):  
G. Thirunarayanan ◽  
Ganesan Vanangamudi ◽  
V. Sathiyendiran
Keyword(s):  
Regression Analysis ◽  
Spectral Data ◽  
Statistical Analyses ◽  
Substituent Constants

A series containing ten (E)-4-(N-(4-cinnamoylphenyl)sulfamoyl)-3-(p-tolyl)-1,2,3-oxadiazol-3-ium-5-olates were prepared and examined their purities by literature method. The infrared and NMR spectral data were assigned and correlated with Hammett substituent constants and Swain-Lupton’s constants using single and multi-regression analysis. From the results of statistical analyses the effects of substituents on the spectral data have been discussed.

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