Forms a chiral adduct with diborane, useful for asymmetric hydroborations with high optical yields: J. Am. Chem. Soc., 99, 5514 (1977). Recrystallization of the borane adduct can be used to obtain a pure single diastereomer: J. Org. Chem., 49, 945 (1984). For reviews of the synthesis of pure enantiomers via chiral organoboranes, see: Acc. Chem. Res., 21, 287 (1988); and of asymmetric reduction with chiral organoboranes based on ɑ-pinene: Acc. Chem. Res., 25, 16 (1992).
