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Reactions of (
S)-
![](/images/gifchars/alpha.gif)
-(methylthio)-2-(
p-tolylsulfinyl)benzyl carbanion with different carbonyl compounds proceeds withcomplete control of the configuration at the benzylic position.Aldehydes yield easily separable mixtures of
![](/images/gifchars/beta2.gif)
-hydroxysulfides, epimers at the hydroxylic carbon, where thestereoselectivity depends on steric factors (from 20% to>98% de).