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HO<br />
OH<br />
57 % H 2 SO 4<br />
O<br />
(100 %)<br />
OH 85 % H 3 PO 4<br />
OH<br />
t<br />
O<br />
(90-94 %)<br />
OH<br />
1) TsCl, C 5 H 5 N, 0 °С<br />
H<br />
H<br />
2) NaOH-ДМЭ, 20 °С<br />
O<br />
HO<br />
(80 %)