1: 69 percent / NBS / methanol / 24 h / Ambient temperature 2: 20 percent / NBS / methanol / 24 h / Ambient temperature 3: 80 percent / 8percent NaOH / methanol / 0.25 h / Heating View Scheme

sodium hydroxide; N-bromosuccinmide 1.) CH3OH, room temperature, 24 h, 2.) CH3OH, room temperature, 24 h; Yield given. Multistep reaction. Yields of byproduct given;

1: 69 percent / NBS / methanol / 24 h / Ambient temperature 2: 90 percent / 8percent aq.NaOH / methanol / 24 h / Ambient temperature View Scheme