Studies on vitamin D and related compounds IX: Remarks on the iodine-catalyzed isomerisations of vitamin D and related compounds
β Scribed by A. Verloop; A. L. Koevoet; R. van Moorselaar; E. Havinga
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 393 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0165-0513
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β¦ Synopsis
Abstract
Details on the iodineβcatalyzed reactions of previtamin D, tachysterol, cisβ and transβvitamin D (influence of solvent, concentration, wavelength of light) are given. The possibility of a previtamin D determination based on the cis/trans isomerisation is indicated. Some results and products obtained from the iodineβcatalyzed reactions in the vitamin D~3~ series are reported.
π SIMILAR VOLUMES
## Abstract The syntheses are described of previtamin D β and vitamin D analogues to be used for the study of the thermal precalciferol β calciferol isomerization reaction. A previtamin D analogue (4) prepared as indicated by Inhoffen could not be obtained in a pure state. Closer inspection reveal
## Abstract Irradiation of ergosterol, lumisterol, tachysterol or previtamin D at room temperature for a long time brings about a considerable lowering of the extinction in the region 220β300 mΞΌ, whereas this phenomenon is not observed on irradiation of these compounds at 80Β°K in solid solution. Fr