反应详情

温度

50 °C

To a mixture of 28.7 g of 2-ethyl-2-hexenal (purity: 99.0%, 0.225 mol), 12.5 g (0.15 mol) of 37% formalin, and 25 ml of methanol heated to 50° C. was added dropwise 3.37 g (0.015 mol) of a 25% aqueous solution of potassium hydroxide over 20 minutes. After the dropping was completed, the mixture was further stirred at 50° C. for 4 hours. The reaction mixture was analyzed by gas chromatography (the internal standard method with diethylene glycol dimethyl ether as an internal standard), and the yields of 2,4-diethyl-5-hydroxy-2-pentenal and 3,5-diethyl-5,6-dihydro-2H-2-pyranol based on the used formaldehyde and the consumed 2-ethyl-2-hexenal were found to be as follows.