1: With boric acid trimethyl ester in tetrahydrofuran; diethyl ether T=-78 - 20°C; 2 h; 2: With hydrogenchloride; water in tetrahydrofuran; diethyl ether 0.5 h; 3: With potassium hydrogen difluoride in methanol; water T=20°C; 1 h;
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