期刊
CATALYSIS TODAY
卷 121, 期 1-2, 页码 65-70出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2006.11.022
关键词
Vitamin E; alpha-tocopherol; antioxidant; metal triflates; rare earth metal triflates
Vitamin E is known as the most important fat-soluble antioxidant in biological systems. The scale for commercially produced (all-rac)-alpha-tocopherol reaches over 25,000 tonnes per year. The known processes for the synthesis of a-tocopherol suffer from disadvantages like formation of by-products and waste-water problem. To overcome these drawbacks, new types of catalysts have been developed. These are rare earth metal triflates, e.g. Bi(OTf)(3), Ga(OTf)(3), Tm(OTf)(3) Or Hf(OTf)(4). This new approach to Vitamin E or derivatives thereof has several advantages, based on high yields (above 94%) and selectivities. (c) 2006 Elsevier B.V. All rights reserved.
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