iodine in dimethyl sulfoxide 2 h; Heating;

1: 85.4 percent / pyridine / 12 h / 20 °C 2: 90.9 percent / potassium hydroxide / dimethylsulfoxide / 2 h / 20 °C 3: 93.2 percent / p-toluenesulfonic acid monohydrate / dimethylsulfoxide / 90 °C 4: 51.1 percent / hydrogen bromide / acetic acid / Heating View Scheme

1: aq. NaOH / methanol / 20 h / 20 °C 2: I2 / dimethylsulfoxide / 2 h / Heating View Scheme

1: 83 percent / 60percent aq. NaOH / 20 h / Ambient temperature 2: 81 percent / DMSO, I2 / 2 h / Heating View Scheme