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6 MHz): ? (ppm) 159, 145.7 (C-Ar), pp.55-58 ,
21 mmol) was dissolved in MeOH (5 mL) at 20°C. Amberlyst H-15 (40 mg) was then added, and the mixture was stirred overnight at 20°C. The resin was then filtered off and the solvents were removed in vacuo. Purification of the crude product by flash chromatography, 82% yield) as a colorless oil ,
21 (s, 1H, pp.6-11 ,
72 (m, 1H, H-10), 5.25-5.20 (m, 2H, H-2'), 5.09-5.01 (m, 3H, H-1, NMR (CDCl 3 , 400 MHz): ? (ppm) 6.03, pp.9582-57466, 1927. ,