1: lithium bromide / tetrahydrofuran / 1 h / 0 °C 2: 1) lithium biphenylide, barium iodide / 1) THF, -78 deg C, 30 min, 2) THF, a) -78 deg C, 1.5 h, b) room temperature, 16 h 3: 95 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 16 h / 23 °C View Scheme