✦ LIBER ✦
An ENDOR study of carotenoid cation radicals on silica—alumina solid supports
✍ Scribed by A.S. Jeevarajan; L.D. Kispert; L. Piekara-Sady
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 500 KB
- Volume
- 209
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
The cation radicals of canthaxanthin, B-carotene and S'-apo+camten-8'-al were chemically prepared on activated sihca-alumina solid supports. An ENDOR study of these cation radicals revealed the hypertine coupling constants of the methyl protons and indicated a carotenoiddependent orientation of the cation radicals bound to the solid support. The Lewis acidic sites of the solid support appear to hc responsible for the chemical formation of the cation radicals and the Bmnsted acidic sites are responsible for the stability of the cation radical produced on the support.