5.3 Historical origin of stereochemistry The following information was available to van t hoff and le bel 1. Only one compound for CH3 X is ever found 2. Only one compound for CH2X2 or CH3 XY ever found 3. Two enantiomeric compounds for CHXYZ are found5.3 Historical origin of stereochemistry • The following information was available to van’t Hoff and le Bel. • 1. Only one compound for CH3X is ever found • 2. Only one compound for CH2X2 or CH3XY is ever found. • 3. Two enantiomeric compounds for CHXYZ are found