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    图2.4 过氧甲酸氧化3-蒈烯
    2.7.4 氧气氧化
    分子氧(氧气或空气)既廉价又绿色环保,在所有环氧化烯烃的制备中是最理想的氧源。但三线态的分子氧非常稳定,直接氧化单线态的烯烃十分困难,必须经过共还原剂活化或适当的催化作用才能使烯烃快速环氧化。
    徐永军等[47]使用含二价镍的Ni( bpy)2Cl2催化剂, 以氧气作为氧源环氧化苯乙烯, 苯乙烯的转化率可达100%,环氧苯乙烷的选择性达81%, 但催化剂经两次循环后活性明显降低。Ire等[48]在甲腈中以亚碘酰苯氧化1, 2-二苯乙烯, 产率达95%, 选择性为48%。
    参考文献
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