反应详情

To a solution of the (±)-6-benzyloxy-2-methoxy-2-methylchroman prepared in Example 45 in 250 ml. of ethanol was added 2.5 g. of 10% palladium on carbon catalyst, and the resulting mixture was hydrogenated at atmospheric pressure and room temperature. After 9 hours, the uptake of hydrogen (3100 ml.) had ceased. The catalyst was removed by filtration and the filtrates were stripped of solvent at reduced pressure. Crystallization of the solid residue from ether-30°-60° petroleum ether gave (±)-6-hydroxy-2-methoxy-2-methylchroman as white needles, m.p. 128°-130°.

1. customwas hydrogenated at atmospheric pressure and room temperature
2. customThe catalyst was removed by filtration
3. customCrystallization of the solid residue from ether-30°-60° petroleum ether