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ÎÄÏ×1£ºA solution of 3 (0.5 9.) and sodium borohydride (0.1 g.) in ethanol (50ml.) was heated under reflux for 2 hours. The mixture was then concentrated,
and the residue recrystallized from water to give the dialcohol, 9(0.35 g., 68%) as yellow needles Õâһƪ·´Ó¦Íê¾ÍÖ±½ÓŨËõÁË£¬ÀïÃæÊ£µÄÅðÇ⻯ÄÆÔõô°ì°¡¡¤¡¤¡¤Î¹~
ÎÄÏ×2£ºA solution of 6 (118 mg, 0.5 mmol) and sodium borohydride (38mg, 1.0 mmol) in ethanol (10 mL) was heated under reflux for
half an hour. The mixture was extracted with ethyl acetate, and the organic phase was dried over Na2SO4. The solvent was
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