The reaction mixture was filtrated, and the filtrate was quenchedby water (2.0 mL) and extracted with EtOAc (20 mL × 3). Thecombined organic phase was washed with brine (20 mL × 2), dried overNa2SO4 and MgSO4, evaporated to dryness, and subjected to columnchromatography (silica gel, petroleum ether/ethyl acetate) to furnishthe product, which was characterized by 1H and 13C NMR to bebenzaldehyde (74% yield).