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 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 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 Hammett Spectral Correlations in some Aryl 1,3-Oxazine-4-Thione Derivatives

2014 ◽  
Vol 36 ◽  
pp. 193-200
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Regression Analysis ◽  
Spectral Data ◽  
Spectroscopic Data ◽  
Room Temperature ◽  
Linear Regression Analysis ◽  
Synthetic Method ◽  
One Pot ◽  
Substituent Constants ◽  
Multi Linear Regression ◽  
Methyl Imidazole

A series of some aryl 1,3-oxazine-4-thione derivatives have been synthesized by 1-methyl imidazole catalyzed three component one pot synthetic method in room temperature. The purities of these thiones were studied by their physical constants and spectroscopic data. The infrared and 13C NMR spectral data of CN and CS were 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 substituent on the spectral data was 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 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.

scholarly journals Preheated Fly-Ash Catalyzed Cyclization of Chalcones: Synthesis of some Substituted Pyrazole-1-Carbothioamides and Spectral Correlations in 3-(3,4-Dichlorophenyl)-5-(Substituted Phenyl)-4,5-Dihydro-1H-Pyrazole-1-Carbothioamides

2013 ◽  
Vol 15 ◽  
pp. 18-34 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Regression Analysis ◽  
Fly Ash ◽  
Linear Regression ◽  
Microwave Irradiation ◽  
Spectral Data ◽  
Linear Regression Analysis ◽  
Solvent Free ◽  
Physical Constants ◽  
Multi Linear Regression ◽  
Substituted 1

Some substituted 1-thiocarbomyl pyrazolines including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides using solvent-free preheated fly-ash catalyzed cyclization between chalcones and thiosemicarbazide microwave irradiation. The yields of these thiocarbomyl pyrazolines are more than 80%. The purities of these synthesised pyrazoline derivatives are checked by their physical constants and spectral data earlier reported in the literature. The spectral data of these 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides had been correlated, using single and multi-linear regression analysis.

The Effect of Service Quality Dimension on Taxpayers’ Satisfaction (Study at Howard Tax Consultant)

2020 ◽  
Vol 18 (3) ◽  
pp. 62
Author(s):  
Gladys Greselda Gosal ◽  
Christina Whidya Utami
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Service Quality ◽  
Linear Regression Analysis ◽  
Likert Scale ◽  
Independent Variables ◽  
Quality Dimension ◽  
Multi Linear Regression ◽  
The Impact

This research aims to explore the impact of service quality towards the satisfaction of taxpayers who use the services of Howard Tax Consultant. Dimensions of the service quality that are used as independent variables are flexibility, reliability, assurance, tangibles, and responsiveness, meanwhile the dependent variable is taxpayers’ satisfaction. All members of the population are taken as the sample of the research, with total of 50 respondents, among those are 35 individual taxpayers and 15 corporate taxpayers. Data was collected through questionnaire with 24 indicators with Likert scale, and was analyzed using multi-linear regression analysis. The result of multi-linear regression analysis shows that flexibility, reliability, assurance, tangibles, and responsiveness are significantly and positively correlated to the satisfaction of taxpayers who use the services of Howard Tax Consultant, and therefore it is concluded that all the hypothesis in this research are upheld.

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