A process for preparing substantially pure enantiomers of formula (I) ##STR1## where the * represents a chiral center, x is 0 or 1, in exo-, endo- or a mixture of exo- and endo- forms; and R is hydrogen, alkyl or aralkyl, via diastereomers of formula (IIA) or (IIB): ##STR2##
一种制备式(I)的基本纯对映体的方法,式中*代表手性中心,x为0或1,为外向型、内向型或外向型和内向型混合形式;R为
氢、烷基或芳基烷基,通过式(IIA)或(IIB)的非对映异构体: