To a reflux apparatus add 150 mL of acetic acid, 40 mL of nitromethane, 21.21 g of 3,4,5-trimethoxybenzaldehyde and 20 mL of cyclohexylamine. Heat at 95°C for 90 minutes and then cool down to 60°C. Slowly add 325 mL of cold water. Then put the mixture into a freezer to crystallize all of the product out. Filter and wash with cold water. Dry in a desiccator.
Addition of the cyclohexylamine
The solution after reflux
Addition of the water
The product crystallized out from the cold solution