Combine 6 mL of glacial acetic acid, 3 mL of water and 5.1 g of iron chloride hexahydrate, heat the solution to boil and then cool slightly until it doesn’t anymore boil. Add 1.2 g of benzoin and reflux for 1 h, then add 30 mL of water and boil for few minutes, cool down to 0°C, filter and wash with 20 mL of water. Recrystallize with hot ethanol.
Refluxing the mixture
Addition of water
Boiling for few minutes and then cooled down and filtered
Recrystallization in ethanol
The pure product