sodium hydroxide; potassium permanganate T=50 - 55°C; 0.5 h;

With  sodium hydroxide; sodium dithionite 0.25 h;  Heating;   

Multi-step reaction with 3 steps 1: 88 percent / methanol / 18 h / Heating2: 99 percent / aq.sodium hydroxide (1 N) / 2 h / Heating3: 89 percent / aq.sodium hydroxide (0.5 N), sodium dithionite / 0.25 h / Heating  

Multi-step reaction with 2 steps 1: 99 percent / aq.sodium hydroxide (1 N) / 2 h / Heating2: 89 percent / aq.sodium hydroxide (0.5 N), sodium dithionite / 0.25 h / Heating