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After we found the non-linear relationship between reaction temperature and enantioselectivity and the unusual electronic effect of the salen-substituent on enantioselectivity which suggested the mediacy of metallaoxetane intermediate, we could not immediately give the conclusion on the reaction mechanism, because inspection of metallaoxetane intermediate with CPK model suggested the presence of steric repulsion between C3 and C3′ substituents. At that time, one of the author (T.K.) had an opportunity to review the manuscript of Norrby, P.-O.; Linde, C.; Åkermark, B. which proposed the epoxidation pathway via a metallaoxetane intermediate. Dr. Norrby kindly informed us that the calculation using UFF force field provided a conformer of metallaoxetanes derived from 3 or 4 to be strain-free. However, the other part of their proposal did not agree with our experimental results.
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