In the asymmetric epoxidation of homoallylic alcohols, a combination of zirconium tetrapropoxide, dicyclohexyltartramide, and t-butyl hydroperoxide was found to give good enantiomeric selectivities (up to 77% ee) especially for (Z)-homoallylic substrates.
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IKEGAMI et al. (1987) studied this question.
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