Journal of the Chemical Society

absorption acetic acid acetic anhydride alkaline aluminium aluminium chloride Amax Amer amine ammonia anhydride aqueous aromatic atoms band benzene bond bromide Calc carbon CH₂ Chem chloride chloroform chromatography cm.¹ complex compound concentration coupling constants crystallised crystals decomp decomposition derivatives dilute dimethyl distilled dried Elution erythroaphin-fb erythroaphins ester ethanol ether ethyl acetate evaporated extracted filtered fluoride formation Found fraction gave halides hydrochloric acid hydrogen hydrolysis hydroxyl infrared infrared spectra iodide irradiated isolated isomer ligand light petroleum lithium aluminium hydride m. p. and mixed maltose MeO MeO mixed m. p. mixture mole molecule nitrogen nuclear magnetic resonance obtained oxidation oxygen phenyl picrate piperidine potassium prepared protoaphin proton pyridine quinone reaction recrystallised refluxed requires residue room temperature sample sodium hydroxide solution solvent spectrum structure substitution Table ultraviolet values washed yellow yield