Enantiomer enrichment of oxprenolol through cellulose tris(3,5‐dimethylphenylcarbamate) membrane

Enantioselective enrichment of racemic oxprenolol dissolved in a hexane‐2‐propanol mixture was achieved with a solid chiral polymer membrane consisting of cellulose tris(3,5‐dimethylphenylcarbamate) coated on a Teflon membrane filter. The oxprenolol obtained through the membrane was rich in (S)‐isomer up to about 50% ee at initial stage and (R) enrichment of a source phase (23% ee) was achieved.