Procedure II for the Synthesis of Epoxides 2. Based on a literature procedure. Hydrogen peroxide (30% in water, 6.0 equiv.) was added to a mixture of olefin (1.0 equiv.) and sodium bicarbonate (4.0 equiv.) in acetonitrile/water 3:2 (50 mM with respect to the olefin). The reaction mixture was stirred at room temperature for 48 h before being quenched by slow addition of 1 M Na2S2O3 until no more peroxide was visible on starch paper. The mixture was reduced in vacuo and the residue was extracted with EtOAc (3 x 10 mL). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The crude was purified by column chromatography to afford the wanted epoxide.