Hydrochloric Acid → Rhein

Beteiligte Stoffe

Reaktionsschritte

Diacerein (150 g, 0.41 mol) was stirred in 10% (w/w) Na2CO3 solution (4 L) resulting in a red mixture. After stirring overnight the mixture was acidified to pH2 with 5M HCl solution to give a yellow precipitate. This was filtered and dried in a vac-oven at 50° C. (168 g,>100%).

Herkunft & Nachweise