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Similar ligands derived from other epoxides are currently studied in our laboratories. The results of these studies will be reported in due time.
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For related examples see ref 4f,g.
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The optimal amount of ligand was determined for 4d as follows: Using a 3% molar amount of ligand, and performing the reaction in hexane, conversion was 96% after 21 h and the enantiomeric excess of the resulting alcohol was 84%. With a 6% molar amount of ligand, conversion was >99% after 3 h, and ee was 89%. No further improvement m enantioselectivity was recorded by increasing the amount of ligand employed.
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