Topic overview

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Racemates are optically inactive through external compensation, unlike meso compounds, which show internal compensation. Although enantiomers have the same physical properties in achiral environments, they can behave differently with chiral reagents, enzymes, and stationary phases. The lesson surveys solid-state forms of racemates and the pharmaceutical distinction between a desired eutomer and a potentially inactive or toxic distomer. Resolution approaches include forming separable diastereomeric salts or derivatives, using stereospecific enzymes, and applying chiral chromatography. Kinetic resolution depends on different reaction rates and has a theoretical yield limitation for a desired enantiomer unless paired with racemization. The topic also introduces enantiomeric excess as a measure of optical purity and considers asymmetric synthesis and the chiral pool as alternatives to resolution.