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化学学报
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化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1322-1326. 上一篇    下一篇

研究论文

氯固相合成Ti-ZSM-5催化苯乙烯环氧化对映选择性 的研究

徐成华;吕绍洁;邱发礼   

  1. 中国科学院成都有机化学研究所.成都(610041);中国科学院天然气开放实验室
  • 发布日期:2000-11-15

Enantioselective epoxidation of styrene on Ti-ZSM-5 synthesized by gas-solid isomorphous substitution

Xu Chenghua;Lu Shaojie;Qiu Fali   

  1. Chengdu Inst Organ Chem, CAS.Chengdu(610041)
  • Published:2000-11-15

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用TiCl~4气固相同晶取代法制得的Ti-ZSM-5作催化剂。研究了以H~2O~2为氧化剂氧化苯乙烯生成环氧苯乙烷的对映选择性，发现生成的环氧苯乙烷主要以R构型为主。考察了反应时间，反应温度，催化剂Ti-ZSM-5以及氧化剂[w(H~2O~2)=30%]的用量等反应条件对苯乙烯环氧化反应对映性的影响。结果表明，反应温度是影响环氧化反应对映选择性的重要因素，降低反应温度有利于提高对映选择性(ee)，当反应温度≤40℃时，ee值可达100%；而反应时间，催化剂及氧化剂[w(H~2O~2)=30%]用量对环氧化反应的对映选择性几乎没有影响。

关键词: 钛, ZSM-5, 苯乙烯, 催化反应, 选择性, 过氧化氢

In this paper, the enantioselective epoxidation of styrene catalyzed by Ti-ZSM-5 prepared from TiCl~4 gas-solid isomorphou substitution using 30% dilute H~2O~2 as oxidizing agent, is repoted. It was found that (R)-styrene oxide was the main product in the reaction system. At the same time, the effects of reaction conditions such as reaction time, reaction temperature and the amounts of catalyst Ti- ZSM-5 and 30% dilute H~2O~2 on the enantioselectivity of styrene epoxidation were also investigated. the results showed that reaction temperature was a major factor for the enantioselective epoxidation of styrene. the ee value increased with the decreasing of reaction temperarure distinctly, and reached 100% when reaction temperature was below 40℃. However, reaction time and the amounts of catalyst Ti- ZSM-5 and 30% dilute H~2O~2 had essentially no effect on the enantioselectivity.

Key words: TITANIUM, STYRENE, CATALYTIC REACTION, SELECTIVITY, HYDROGEN PEROXIDE

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