The same effect was observed in enantioselectivity and the sulfoxide selectivitywhen the reaction temperature was decreased. The enantiomeric excess increasedfrom 5% at 25 C to 8% at 0 C and 10% at -10 C. On the basis of this result, it isthought that the increase in sulfoxide selectivity with the decrease of the reactiontemperature would improve the degree of enantiomeric excess.
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