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a-chlorocyclohexyl phenyl ketone a-halogenated ketones absolute configuration absolute ethanol acetic acid acid XIV afforded Anal analgetics aqueous benzene benzoic acid Calcd carbanion carbonyl carbonyl group chlorine free chloropiperidine compound conformations Cotton effect curve Crystallization from skelly cyclohexyl phenyl ketone cyclopropanone dispersion rule enantiomers ether ethyl Favorskii rearrangement filtered through sintered formation free amine give halogen hydrochloric acid hydrochloride salt hydroxypiperidine intermediate intramolecular iodide isolated isonicotinic acid isonicotinic acid methochloride ketone LXIV l-methyl-3-benzoyl-3-hydroxypiperidine LVII LXIII LXIVe LXVII LXXXI methanol free mole negative Cotton effect nitrogen mustards non-polar nucleophile catalyzed obtained octane solution optically active ORD curves pethidine pethidine and p-pethidine phenyl ketone XCIV piperidine quasi-Favorskii rearrangement racemic reaction mixture reaction terminus recrystallized rotamer rotational isomers single Cotton effect sintered glass skeletal rearrangement sodium amide sodium hydroxide solvent was removed stereochemistry steric Stevens and Farkas substituents synthesis thionyl chloride treated with carbon XLVII xylene