trifluoroacetic acid in benzene Ambient temperature12-18 h;

1: water containing sulfuric acid / 140 °C 2: diethyl ether View Scheme

diethyl ether

1: 1.) lithium bis(trimethylsilyl)amide / 1.) THF, -78 deg C, 30 min, 2.) gradually warmed to room temp., 2-3 h, room temp. 2: 80 percent / trifluoroacetic acid / benzene / Ambient temperature; 12-18 h View Scheme

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