Impressive enantiomer excesses of 99% were achieved in the protonation of thioester enolate 2, prepared from racemic 1, with the chiral proton sources (−)- and (+)-N-isopropylephedrine ((−)-3 and (+)-3). This large-scale procedure allows access to many enantiopure terpenoids.
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Fehr et al. (1993) studied this question.
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