| 摘要 |
The olefins of formula <IMAGE> in which the symbols R represent hydrogen or certain hydrocarbon radicals, are converted to the corresponding epoxides by reacting with hydrogen peroxide at pH 6-9, in the presence of a catalyst containing an arsenic, antimony or bismuth derivative, for example an organometallic derivative, and a derivative of an element of groups IVA, VA or VIA of the periodic system, for example a carbonyl derivative of molybdenum, tungsten, titanium or vanadium. The reaction is carried out between 0 and 100 DEG C and between 0 and 100 bars. The catalyst involved has a long lifetime and makes it possible to obtain good selectivity towards the epoxide.
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