Separation of Enantiomers by Partition between Liquid Phases. Enantioselectivity of Diastereoisomeric Dimenthyl Tartarates towards α‐Aminoalcohol SaltsThe enantioselectivity of the easily obtainable diastereoisomeric dimenthyl tartaratesIandIItowards the salts of a series of α‐aminoalcohols1‐10was investigated by partition between aqueous and lipophilic phase. The measured enantiomer distribution constantsQ(=KA/KB) confirm the previously observed configurational relationships between the lipophilic tartarates and the preferentially extracted enantiomer of the hydrophilic ammonium slat. However, the (R,R)‐esterIis appreciably more selective than its (S,S)‐diastereoisomerIIor other previously investigated esters. The tartaratesI‐IIItransport norephedrin salts through bulk lipophilic membranes with enantioselectivity comparable to that observed in partition experiments. The most enantioselective esterIcan be used as an efficient mobile phase for preparative separation of norephedrine enantiomers by flash partition c