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O<br />
HO<br />
OH<br />
15 % H 2 SO 4<br />
t<br />
H<br />
(100 %)<br />
O<br />
HO<br />
OH<br />
35 % H 2 SO 4<br />
t<br />
(81 %)<br />
OH<br />
O<br />
Et<br />
OH<br />
Et<br />
BF 3 *Et 2 O<br />
CHCl 3<br />
Et<br />
Et<br />
(100 %)