非对称双席夫碱铜配合物催化环己烯氧化研究

Study on epoxidation of cyclohexene catalyzed by asymmetric bis-Schiff base copper complexes

本文合成了一系列含有不同取代基的非对称双席夫碱铜配合物,采用~1H NMR、^(13)C NMR FI-IR对其结构进行表征;然后以该类配合物为催化剂、30%H_2O_2为氧源,研究了其在乙腈/NaHCO_3混合溶液中对环己烯环氧化反应的催化活性及反应条件。结果表明:含有两个较强吸电子基团-Br的配合物5的催化活性较优,且反应温度为35℃,时间2h,n_(H_2O_2):n_(环己烯)=3时,环己烯的转化率为85.5%,环氧环己烷的选择性为37.9%。

In this paper, a series of asymmetric bis-Schiff base copper complexes with were synthesized, char- acterized by 1H NMR, 13C NMR and FT-IR. Then, their catalytic activities and the reaction conditions for epoxida- tion of cyclohexene were studied with 30% hydrogen peroxide in the acetonitrile/sodium bicarbonate solution. The results showed that complex 5 with the involvement of 3,5-dibromo groups showed the better catalytic activity and the conversion rate of cyclohexene reached 85.5%, the selectivity of cyclohexene oxide was 37.9% under the reac- tion temperature 35℃, reaction time 2h and n（H2O2） ： n （cyclohexeoe）=3.