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Mo the better! Chiral Mo complexes promote highly efficient asymmetric ring-opening/cross-metathesis reactions that afford functionalized piperidines in high E:Z selectivity and enantiomeric purity (see scheme for example; TBS=tert-butyldimethylsilyl). In most cases, Ru catalysts are ineffective.
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Cortez et al. (2007) studied this question.
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