Hydrochloric Acid → 4-Ethoxycinnamic Acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 4-ethoxybenzaldehyde (1.00 mL, 7.20 mmol) and piperidine (0.11 mL, 1.08 mmol) in 40 mL of pyridine was heated to 120° C. A solution of malonic acid (1.50 g, 14.40 mmol) in 40 mL of pyridine was added dropwise over 30 min and the reaction solution was stirred at 120° C. for 4 h. After cooling down to 0° C., excess amount of concentrated HCl was added carefully to make ˜pH 1. A white crystalline precipitate formed, and the solid was collected by filtration, washed with 0.1 N HCl aqueous solution, and dried to afford compound 19 in 99.5% (1.40 g) of pure 19 as a white solid.

Herkunft & Nachweise