1: 1,1,2,2-tetrafluoroethylene With 1,1,1,3,3,3-hexamethyl-disilazane T=0°C; Cooling with acetone-dry ice; 2: With n-butyllithium in hexane T=-50°C; 2 h; 3: 1,1,1,3,3,3-hexafluoropropan-2-yl benzoate With hydrogenchloride more than 3 stages;

1: hexafluoroisopropyl alcohol With n-butyllithium in tetrahydrofuran; hexane 2: benzoyl chloride in tetrahydrofuran; hexane

in tetrahydrofuran Ambient temperature;

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