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have tried the following metal ions: Cu(OTf)2 Cu(OTf) Zn(OTf)2 Mg(OTf)2 La(OTf)3 Sc(OTf)3 Y(OTf)3 and Yb(OTf)3."},{"key":"e_1_2_3_75_2","unstructured":"\u00a0"},{"key":"e_1_2_3_76_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00538a077"},{"key":"e_1_2_3_77_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00001a019"},{"key":"e_1_2_3_78_2","unstructured":"Also see the references [3] and [5]."},{"key":"e_1_2_3_79_2","unstructured":"The fundamental work using Al(OiPr)3as a Lewis acid in organic synthesis is the Meervein\u2010Ponndorf\u2010Verley (MPV) reduction and for selected recent examples of chiral aluminum catalysts 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