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烯烃的环氧化反应多用有机过氧酸作为氧化剂,但有机过氧酸易分解,操作欠安全,有爆炸的危险,为此,我们进行了用过硼酸钠取代有机过氧酸对烯烃环氧化的研究,并取得了较为满意的结果. 过硼酸钠NaBO_3·4H_2O为一稳定的无机过氧酸盐,它在有机化学中的应用甚少.为了使它有效地参与烯烃的环氧化反应,我们曾按文献中采用过的方法,在碱性水溶液中或在醋酸介质中进行反应,但均未获得成功.后经反复筛选,发现它与酷酐在二氯甲烷溶剂中可顺利地将烯烃氧化为相应的环氧化合物:
Epoxidation of olefins using organic peroxyacid as the oxidant, but the organic peroxyacid is easy to decompose, the operation is not safe, there is the danger of explosion, for which we carried out the use of sodium perborate instead of organic peroxyacid epoxy And has achieved more satisfactory results.Naoborohydrate NaBO 3 · 4H 2 O is a stable inorganic peroxyacid which has little application in organic chemistry.In order to make it effective in the epoxidation of olefins , We have used the method used in the literature, in alkaline aqueous solution or in acetic acid medium reaction, but did not succeed.After repeated screening and found that it with anhydride in methylene chloride solvent can smoothly be Oxidation of olefins to the corresponding epoxy compounds: