N-Methyl-N-dodecyl-or N-methyl-N-hexadecylephedrinium bromides and sodium borohydride stereoselectively reduce ketones by phase transfer catalysis in aqueous 1,2-dichloroethane; the optical yield depends on chain length and concentration of the surfactants.
J. P. Massé and E. R. Parayre, J. Chem. Soc., Chem. Commun., 1976, 438b DOI: 10.1039/C3976000438B
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