1: 62 percent / K2CO3 / 16 h / Ambient temperature 2: 6 h / 60 °C 3: 15 percent HCl / 1) 16 h, r.t.; 2) 30 min, 60 deg C 4: 98 percent / H2 / Pd/C / acetic acid / 1 h / Ambient temperature View Scheme