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13C NMR accepted revised acetic acid acetonitrile acetyl alcohol aldehyde Anal anhydrous antimicrobial activity Ar-H aryl-H atom benzene Calcd carbon carbonyl catalyst CDCI3 CH=CH chalcones Chem Abstr Chem Soc chemical shifts chloride chromatography Compd compounds coumarin crystals cyclic Delhi Department of Chemistry derivatives dichloromethane dried ester estrone estrone methyl ether ethanol ethyl acetate EtOH Experimental Section extracted filtered Found H NMR CDC13 heterocyclic HNMR hydrazine hydrogen Indian J Chem isoxazole Melting points methyl microwave mmole moiety mole molecular nitro compounds NMR spectra obtained OCH3 organic oxidation peak phenyl polymer prepared presence protons pyridine reaction mixture reagent Reddy refluxed residue ring room temperature Scheme silica gel singlet sodium solid solution solvent spectra were recorded spectral data spectrometer spectrum stirred structure substituted synthesis Table Tetrahedron Lett tion washed with water yield