The diastereoisomeric complexes 3 between α-phenylseleno-alkyllithium compounds 1 and a chiral diamine 2 are trapped by aldehydes more rapidly than the complexes equilibrate, such that the e.e. of the adducts 4, 5 reflects the diastereoisomer ratio of the complexes 3.
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Klute et al. (1993) studied this question.
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