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absolute ethanol activity added addition alcohol allowed ammonium amount Anal analgesic anhydrous approach Attempted Preparation basic bath bensilic acid benzene benzyl boiling bromide brown carbon tetrachloride Cels Chem chloride compound concentrated cooled crude cyclic compound cyclization derivative dilute diphenylbromoacetic acid diphenylchloroacetate dissolved distilled dried drug ether ethyl ethylene oxide evaporated extracted failed filtered flask flask fitted following equations formed Found free amine gave a negative give glacial acetic acid heated hydrobromide hydrochloride hydrogen bromide hydrogen chloride hydroxide liquid melting point Methadone method methylamine methylaminodiphenylacetic acid minutes mole morphine natural negative test obtained organic overnight pain placed precipitated Preparation pressure reaction mixture recrystallized refluxed removed residual round-bottom flask salt sample saturated setting sodium solid separated solution starting synthetic temperature test for halogen tion treated tube weight white solid yield