超声场中环已烯的环氧化反应

EPOXIDATION OF CYCLOHEXENE IN ULTRASONIC FIELD

研究了超声辐照下过氧化氢在Ｖｅｎｔｕｒｅｌｏ催化剂存在下对环已烯的环氧化反应，考察了相转移催化剂用量、过氧化氢浓度、反应温度及时间对反应的影响。实验结果表明，超声能加速环氧化反应，稀浓度过氧化氢（２．６％）即可使环氧化反应在温和的条件下高产率地进行。但随着温度的升高和反应时间的增长，超声和非超声辐照下反应速度及产率的差别将逐渐减少。

おtudies on the effects of ultrasound on the epoxidation of cyclohexene with H2O2 under the catalysis of Venturello have been carried out in terms of the amount of PTC, concentration of H2O2, temperature and irradiation period. The results indicate that ultrasound can accelerate the epoxidation. It has also been found that the epoxidation can be carried out with very dilute H2O2 (2.6%) over Venturello′s catalyst under mild condition giving good yield. However, along with the increase in reaction period and temperature, the difference between the yields of ultrasonic and unultrasonic reactions are ameliorated and so for the rates.