1: With potassium carbonate in tetrahydrofuran; water T=0 - 5°C; 0.5 h; 2: With sodium hydroxide in tetrahydrofuran; water T=5 - 10°C; pH=13.5; 3: With hydrogenchloride in water T=-10 - 0°C; pH=< 2; 4 h;
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