1: (4-Methylphenyl)-magnesium bromide With copper (I) cyanide in tetrahydrofuran T=-78 - -20°C; Inert atmosphere; 2: pentafluoropropen-1-yl 4-methylphenyl sulfone in tetrahydrofuran T=-78°C; 1 h; Inert atmosphere; 3: With ammonium chloride in tetrahydrofuran; water Cooling with ice;

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(i) SbF5, liq. SO2, (ii) H2O; Multistep reaction;