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 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 1H NMR Spectral Studies of some 2-Amino-4-Isopropyl-6-Methoxy-N-Phenylpyrimidine-5-Carboxamides: Assessment of Substituent Effects

2014 ◽  
Vol 38 ◽  
pp. 15-25 ◽  
Author(s):  
R. Arulkumaran ◽  
R. Sundararajan ◽  
V. Manikandan ◽  
V. Sathiyendiran ◽  
S. Pazhamalai ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Spectral Data ◽  
Linear Regression Analysis ◽  
Substituent Effects ◽  
Spectral Studies ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
H Nmr ◽  
Multi Linear Regression ◽  
Spectral Group

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.

scholarly journals Synthesis and Spectral Studies of some N-[(E)-Phenylmethylidene]benzenesulfonamides

2013 ◽  
Vol 13 ◽  
pp. 249-258
Author(s):  
K.G. Sekar ◽  
Ganesamoorthy Thirunarayanan
Keyword(s):  
Regression Analysis ◽  
Statistical Analysis ◽  
Linear Regression ◽  
Microwave Irradiation ◽  
Spectroscopic Data ◽  
Linear Regression Analysis ◽  
Solvent Free ◽  
Spectral Studies ◽  
Solvent Free Conditions ◽  
Substituent Constants

A series of some N-[(E)-phenylmethylidene]benzenesulfonamide derivatives have been synthesised using solid SiO2-H3PO4 catalyst under solvent free conditions in microwave irradiation. The synthesised E-N-benzene sulfonilimines purities have been verified by their physical constants and spectroscopic data. The spectral frequencies are correlated with Hammett substituent constants, F and R parameters using linear regression analysis. From the results of statistical analysis the effect of substituents on the group frequencies will be discussed.

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 Assessment of Substituent Effects from IR & NMR Spectra of some Substituted Benzylidene-5-Ethyl-1,3,4-Thiadiazole-2-Amines

2013 ◽  
Vol 24 ◽  
pp. 89-98
Author(s):  
Ganesamoorthy Thirunarayanan
Keyword(s):  
Spectroscopic Data ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Linear Regression Analysis ◽  
Substituent Effects ◽  
Solvent Free ◽  
Substituent Constants ◽  
Multi Linear Regression ◽  
Solvent Free Synthesis ◽  
Spectral Group

A series containing ten titled compounds were synthesized by SiO2:H3PO4 catalyzed solvent-free condensation of substituted benzaldehydes and 2-amino-5-ethyl-1,3,4-thiadiazole under microwave irradiation. The yields of prepared amines are more than 90%. The synthesized amines were characterized by their physical constants and spectroscopic data reported in literature earlier for known compounds. The assigned spectral group frequencies such as infrared νC=N, C-S-C, N-N (cm-1) and NMR chemical shifts (δ, ppm) of CH, C=N have been 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 substituent on the above spectral data have been discussed.

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 Hammett Spectral Correlations in Benzofuranyl Flavonols

2014 ◽  
Vol 25 ◽  
pp. 39-47
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Hydrogen Peroxide ◽  
Regression Analysis ◽  
Linear Regression ◽  
Sodium Bicarbonate ◽  
Spectroscopic Data ◽  
Chemical Shifts ◽  
Linear Regression Analysis ◽  
Infrared Spectral ◽  
Substituent Constants ◽  
Multi Linear Regression

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.

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.

Sign in / Sign up

Export Citation Format

Share Document