The Darzens condensation of symmetric and unsymmetric ketones with (–)-8-phenylmenthyl α-chloroacetate diastereoselectively affords glycidic esters in 77–94% de; the stereochemistry [(2R,3R) configuration] of the product is understandable in terms of π–π interaction in the open transition state model.
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Ohkata et al. (1996) studied this question.
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