Various optically active areneseleninic acids (ArSeO 2 H; Ar= 4-Me-C 6 H 4; 4-MeO-C 6 H 4; 2-MeO-C 6 H 4; 2-MeOCO-C 6 H 4; 2, 4, 6-Me 3-C 6 H 2; 2, 4, 6-Et 3-C 6 H 2; 2, 4, 6-i Pr 3-C 6 H 2; 2, 4, 6-t Bu 3-C 6 H 2; 2, 4-t Bu 2-6-MeO-C 6 H 2) were obtained as solutions by optical resolution on a chiral column using medium-pressure liquid chromatography. Concentration of the eluate by evaporation under reduced pressure yielded completely ...