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Other Epoxidation Methods

Other Epoxidation Methods: Introduction

In addition to the epoxidation of olefins with peracids, the following alternative processes are known:

  • Chlorohydrin process (indirect epoxidation): Reaction of the olefin either with hypochlorous acid or with chlorine and water gives the chlorohydrin which subsequently yields the epoxide on alkaline treatment.
Fig.1
Chlorohydrin process
  • Halcon reaction: Epoxides also can be prepared by treating olefins with alkyl hydroperoxides, mainly tert-butyl hydroperoxide, catalyzed by vanadium, titanium or molybdenum complexes.
Fig.2
Halcon reaction
Fig.3
Epoxidation with dioxirane
Fig.4
Epoxidation with atmospheric oxygen
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