1: With trifluoromethylsulfonic anhydride; triethylamine in dichloromethane T=0 - 20°C; 1 h; 2: With sulfur; sodium sulfate in ethanol; water 0.333333 h; 3: With hydrogenchloride; sodium hydroxide more than 3 stages;

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iron; acetic acid T=20°C; 6 h;