Rhodium-Catalyzed Deuterioformylation of 3-Methyl-1-pentene

3-Methyl-1-pentene was deuterioformylated in the presence of rhodium-catalyst. The extent of attack on each face of the olefin was evaluated from the diastereomeric composition of both positional isomers obtained as the products. An overall preferred attack on the si-si face of the (S)-enantiomer, and on the re-re face of the (R)-enantiomer was found.