A mixture of p-tolualdehyde (50 mmol), 4-methyl acetophenone (51 mmol), and aqueous sodium hydroxide (2%, 150 mL) was stirred at room temperature for 30 min before heating at 60 °C for six h. The reaction mixture was cooled to room temperature, and a light-yellow precipitate was filtered. The compound was washed with H2O before drying.