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A range of enantiomerically pure 4‐substituted 5‐amino‐1,3‐dioxanes has been condensed with 2‐(2‐bromoethyl)benzaldehyde to produce chiral dihydroisoquinolinium salts, which are effective asymmetric catalysts for the epoxidation of simple alkenes, giving ees of up to 71 %. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
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Page et al. (2005) studied this question.
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