1.1: 2,4,6-trichlorobenzoyl chloride; triethylamine / tetrahydrofuran / 1 h / 0 °C 1.2: 0.14 g / DMAP / toluene; tetrahydrofuran / 4 h / 20 °C 2.1: 92 percent / zinc; ammonium chloride / methanol / 0.33 h / Heating 3.1: 95 percent / hydrogen fluoride-pyridine / tetrahydrofuran / 16 h / 20 °C 4.1: 30 percent / m-CPBA / CHCl3 / 5 h / -10 - 0 °C View Scheme

1.1: 2,4,6-trichlorobenzoyl chloride; triethylamine / tetrahydrofuran / 1 h / 0 °C 1.2: 0.14 g / DMAP / toluene; tetrahydrofuran / 4 h / 20 °C 2.1: 92 percent / zinc; ammonium chloride / methanol / 0.33 h / Heating 3.1: 95 percent / hydrogen fluoride-pyridine / tetrahydrofuran / 16 h / 20 °C View Scheme