Formation of a racemic mixture in hydrolysis of enantiotopic ester groups with achiral acid. Use of a chiral acid catalyst to render hydrolysis enantioselective. Enzymes as nature's stereoselective catalysts.

00:00 Achiral Catalysis Yields a Racemate
02:47 Stereotopic Relationships Revisited
03:47 Chiral Catalysts are Enantioselective
07:01 Enantioselective Catalysis by Enzymes