Ganesan Vanangamudi

Synthesis, spectral studies and antimicrobial activities of some 2-naphthyl pyrazoline derivatives

A series of 2-naphthyl pyrazolines were synthesized by the cyclization of 2-naphthyl chalcones and phenylhydrazine hydrochloride in the presence of sodium acetate. The yields of pyrazoline derivatives are more than 80%. The synthesized pyrazolines were characterized by their physical constants, IR, (1)H, (13)C and MS spectra. From the IR and NMR spectra the C=N (cm(-1)) stretches, the pyrazoline ring proton chemical shifts (ppm) of δ(Ha), H(b) and H(c) and also the carbon chemical shifts (ppm) of δC=N are correlated with Hammett substituent constants, F and R, and Swain-Luptons parameters using single and multi-regression analyses. From the results of linear regression analysis, the effect of substituents on the group frequencies has been predicted. The antimicrobial activities of all synthesized pyrazolines have been studied.

Synthesis and insect antifeedant activities of some substituted styryl 3,4-dichlorophenyl ketones

Sixteen substituted styryl 3,4-dichlorophenyl ketones [(2E)-1-(3,4-dichlorophenyl)-3-phenyl-2-propen-1-ones] were synthesized using eco-friendly benign stereoselective crossed-aldol reaction. They are characterized by their analytical, infrared, NMR and mass spectral data. The insect antifeedant activities of these chalcones were evaluated using Caster semilooper and Achoea janata L.

Solvent-free synthesis, spectral correlations and antimicrobial activities of some aryl imines.

A series of aryl imines have been synthesized by Fly-ash: H2SO4 catalyzed microwave assisted process under solvent-free conditions. The yields of the imines have been found to be more than 87%. The purity of all imines has been checked using their physical constants and spectral data as published earlier in literature. The UV λmaxCN(nm), infrared νCN(cm(-1)), NMR δ(ppm) of CH and CN 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 synthesised imines have been studied using Bauer-Kirby method.

Hydroxyapatite catalyzed aldol condensation: synthesis, spectral linearity, antimicrobial and insect antifeedant activities of some 2,5-dimethyl-3-furyl chalcones.

A series of 2,5-dimethyl-3-furyl chalcones [2E-1-(2,5-dimethyl-3-furyl)-3-(substituted phenyl)-2-propen-1-ones] have been synthesized by Hydrotalcite catalyzed aldol condensation between 3-acetyl-2,5-dimethylfuron and substituted benzaldehydes. Yields of chalcones are more than 80%. These chalcones were characterized by their physical constants and spectral data. The group frequencies of infrared ν(cm(-1)) of CO s-cis and s-trans, CH in-plane and out of plane, CH=CH out of plane, C=C out of plane modes, NMR chemical shifts δ(ppm) of Hα, Hβ, CO, Cα and Cβ of these chalcones were correlated with Hammett substituent constants, F and R parameters using single and multi-regression analyses. From the results of statistical analyses, the effects of substituents on the group frequencies are explained. Antibacterial, antifungal and insect antifeedant activities of these chalcones have been studied.

Synthesis, spectral studies, antimicrobial, antioxidant and insect antifeedant activities of some 9H-fluorene-2-yl keto-oxiranes

Thirteen ee (αS, βR) 9H-fluorene-2-yl keto-oxiranes (2-(9H)-fluorene-4-yl[3-(substituted phenyl)oxiran-2-yl]methanones) have been synthesized by phase transfer catalysed epoxidation of 9H-fluorene-2-yl chalcones. The yields of oxiranes are more than 95%. The synthesized oxiranes have been characterized by IR, (1)H, (13)C and GC-MS spectral data. The spectral data are correlated with Hammett substituent constants and Swain-Lupton parameters. From the regression analysis, the effect of substituents on the group frequencies has been predicted. The antimicrobial, antioxidant and insect antifeedant activities of all the synthesized oxiranes have been studied.

Solvent-free synthesis, spectral correlations and antimicrobial activities of some aryl E 2-propen-1-ones.

Totally 38 aryl E 2-propen-1-ones including nine substituted styryl 4-iodophenyl ketones have been synthesised using solvent-free SiO2-H3PO4 catalyzed Aldol condensation between respective methyl ketones and substituted benzaldehydes under microwave irradiation. The yields of the ketones are more than 80%. The synthesised chalcones were characterized by their analytical, physical and spectroscopic data. The spectral frequencies of synthesised substituted styryl 4-iodophenyl ketones have been correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. The antimicrobial activities of 4-iodophenyl chalcones have been studied using Bauer-Kirby method.

PREHEATED FLY-ASH CATALYZED ALDOL CONDENSATION: EFFICIENT SYNTHESIS OF CHALCONES AND ANTIMICROBIAL ACTIVITIES OF SOME 3-THIENYL CHALCONES

In the present study we have prepared a series of some chalcones using solvent - free Aldol - condensation by microwave irradiation. The yields of the ketones are more than 60%. The synthesised chalcones were characterized by their analytical, physical and spectral data. The antimicrobial activities of substituted styryl 3-thienyl ketones have been studied using Bauer-Kirby method.

Synthesis, Characterization and Synthetic Applications of Fly-ash:H3PO4 Nanocatalyst

Abstract The solid acidic nanocatalyst fly-ash:H3PO4 was prepared and characterized by FT-IR, SEM, EDS and TEM analysis. This catalyst was utilized for aldol condensation, coupling and cyclization reaction. The effect of catalytic activity of this fly-ash:H3PO4 nanocatalyst was studied with the obtained yield of products under solvent-free conditions. In this synthetic reaction the obtained yields were more than 95 %.

SOLID FLY-ASH:H2SO4 CATALYZED MICROWAVE ASSISTED SOLVENT-FREE CONDENSATION:SYNTHESIS OF SOME TRIFLUOROMETHYL-IMINES

ABSTRACT Good yield of trifluoromethyl-imines have been synthesized by Fly-ash:H 2 SO 4 catalyzed condensation of anilines and phenyl trifluoromethyl ketone in mi-crowave irradiation under solvent free conditions. Keywords: Fly-ash:H 2 SO 4, Greener synthesis, Trifluoromethylimines, Anilines. e-mail: drgtnarayanan@gmail.com INTRODUCTION Chiral imine derivatives possess multipronged biological activities such as antimicrobial 1 , anticancer 2 , antiplasmodic-antihypoxic 3 , antitubularcular 4 , nematicidal, insecticidal1e 5 , anti-inflammatory, and lipoxygenase 6 . The imine moieties are important intermediate and versatile starting materials for synthe-sis of chiral amines 7-13 pyrimidine derivatives, phenylhydrazones, azomethines, indoles, quinoxalines, imidazoles, by hydrogenation 14 , nucleophilic addition with organometallics 15 and cycloaddition reaction 16 . The unique condensation of carbonyl compounds with amines is a well-known reaction. Many reagents 17 was obtained on evaporation of solvent. The solid, on recrystallization with were used for synthesis of optically active imines such as Lewis acids, mo-lecular sieves in ionic liquids, infrared