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University Gorakhpur Pongaflavone a New Chromenochromone an Analogue
S Hotchandani S K Mukerjee
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acetic acid acetone adducts adsorption alkali aluminium amine aromatic atom bands benzaldehyde benzene benzyl bond Calc carbon carbonyl chelates Chem Chemistry Vol chloride chloroform chromatography colour colourless complexes compounds concentration constant cooled crystallized from ethanol cyclization Delhi Department of Chemistry derivative dimethyl dioxane distilled dried electron eluted ester ethanol ethyl acetate EtOH evaporated filtered formation Found fraction gave heated hydrochloric hydrogen hydrolysis hydroxide Indian Journal inorg isatin Journal of Chemistry ketone ligand MeOH metal method methyl mmoles mole molecular molecules needles Ni(II nitrogen NMR spectrum obtained oxidation phenol potassium precipitate prepared presence protons pyridine reaction mixture reduction refluxed requires residue room temperature salt showed silica gel sodium sodium hydroxide solid solution solvent spectra stirred structure synthesis Table tion titration values vanadium(V vmax washed yellow yield