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R<br />
H<br />
O<br />
+ R 2 MgBr<br />
эфир<br />
BrMgO<br />
R 1 R 2<br />
H 2 O<br />
NH 4 Cl<br />
OH<br />
R 1 R 2<br />
1) LiAlH 4 ; ТГФ; 0 °C<br />
2) H 2 O<br />
(83 %)<br />
O<br />
HO<br />
Me<br />
O<br />
H<br />
1) BH 3 ; эфир<br />
OH<br />
Et<br />
Me<br />
2) H 2 O