1: 94 percent / 16 h / 0 °C 2: 1.) AcOH 2.) NaBH4, CeCl3 / <Rh(OAc)2>2 / 1.) 2 hour, room temperature 2.) MeOH, 0 gradC View Scheme

sodium tetrahydroborate; cerium(III) chloride; acetic acid; dirhodium tetraacetate 1.) 2 hour, room temperature 2.) MeOH, 0 gradC; Yield given. Multistep reaction;

water; acetic acid in acetone