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We report the first measurements of Raman optical activity (ROA) in ephedrine molecules. In-phase dual circular polarization (DCPI) ROA spectra have been recorded for (1S,2R)-ephedrine, (1S,2R)-norephedrine, (1S,2S)-pseudoephedrine and (1S,2S)-norpseudoephedrine as hydrochloride salts in H2O solution. The spectra are interpreted in relation to the small changes in molecular structure among these four molecular species.
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Yu et al. (1993) studied this question.
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