Electrochemical epoxidation of electron-poor olefins using silver bipyridine based redox mediators
✍ Scribed by Christof Kandzia; Eberhard Steckhan
- Book ID
- 104214299
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- French
- Weight
- 279 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
A-Electroge&tatad and ngeneratad ailver(III)oxo bia(23'-bipyridine) and similar complexes can act as redox catalysts for the indirect electrochemical epoxidation of electmn-deficient oletins in aqueous ace&m&rile. Thus, isobutyl methacryMe is electmlyaed to form 'the epoxide with 87% material yield and 21% current yield The epoxidation of alkenes is one of the most important technical oxidations. Thus, the formation of ethylene oxide from ethylene is performed worldwide with a capacity of about 8 million tons per year applying heterogeneous cataIysis with a silver baaed catalystIt]. However, ptopylene oxide already has to be produced differently because of lacking selectivity. This is also true for other higher epoxides. Then&m. in these cases, either the chlorohydrine process or the oxirane ptocess using hydropetoxides has to be applied, both producing couple products or being dependent on chlorine production. An electrochemical process in homogeneous solution would solve this problem because no couple products are formed, and the an&e behaves as a clean, reagent-free oxidant. However, this reaction dae not proceed directly at the anode but needa an electrogenerated