(1r,2r)-(-)-pseudoephedrine; diethylzinc; oxygen in toluene 1.) -78 deg C, 30 min, 2.) 0 deg C, 3.5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

C57H55N; dihydrogen peroxide in water; toluene T=20°C; 14 h; optical yield given as percent eeenantioselective reaction;

dipyridinium dichromate

1: (-)-diisopropyl tartrate, t-BuOOH, Ti(OiPr)4 / 15 h / -20 °C 2: 75 percent / pyridinium dichromate View Scheme