then washed with aqueous sodium bicarbonate solution (3 × 50 mL). The organic phase was dried (MgSO4) and concentrated in vacuo to yield the crude mesyloxyester which was purified by column chromatography on silica gel (hexane-dichloromethane, 1:1) to give 1.58 g (65%) of the title compound, mp 91–92°; IR (KBr) 1760 cm−1 (CO); 1H NMR (CDCl3): δ 3.10 (s, 3H), 3.80 (s, 3H), 6.00 (s, H), 7.40–7.80 (m, 5H); 13C NMR (CDCl3): δ 168.2 (s), 132.2 (s), 130.0 (s), 129.0 (s), 127.7 (s), 78.9 (s), 53.0 (s), 39.45 (s); MS, m/z 185 (53), 165 (15), 145 (15), 107 (100), 90 (12), 79 (65), 51 (17). References Organic oxidation reactions