gold(III) chloride; silver hexafluoroantimonate in toluene T=100°C; 10 h;

PPA T=90°C; 0.666667 h;

1: 93 percent / 1.5 M HCl / 2 h / Ambient temperature 2: 1) NaH / 1) DMSO, 15 min, 2) DMSO, room temperature, 3 h, then 70 deg C, 1.5 h, then room temperature, overnight 3: 74 percent / aq. KOH / methanol / 1 h / Heating 4: 69 percent / polyphosphoric acid / 0.67 h / 90 °C View Scheme

1: 74 percent / aq. KOH / methanol / 1 h / Heating 2: 69 percent / polyphosphoric acid / 0.67 h / 90 °C View Scheme

1: 2 N NaOH / methanol / 3 h / Heating 2: neat (no solvent) / 0.17 h / 200 - 230 °C View Scheme

hydrogenchloride; aluminium trichloride T=25°C; 720 h; sealed tube;

cesium fluoride in acetonitrile 5 h; Reflux; regioselective reaction;

1: SnCl2 / acetic acid 2: 10 percent / AlCl3/HCl(g) / 720 h / 25 °C / sealed tube View Scheme