## Abstract Kinetic experiments on the isomerization of lumisterol~2~ under the influence of ultraviolet light of various wavelengths are reported. The experiments indicate that neither tachysterol~2~ nor ergosterol are primary reaction products of lumisterol~2~. Lumisterol~2~ is exclusively conver
Studies on vitamin D and related compounds XVII: The photo-formation of lumisterol
β Scribed by Georgine M. Sanders; E. Havinga
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 348 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0165-0513
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract Details on the iodineβcatalyzed reactions of previtamin D, tachysterol, __cisβ__ and __trans__βvitamin 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 resu
## Abstract The quantum yields of the isomerizations of preβergocalciferol and tachysterol~2~ in ether at 20Β° under the influence of ultraviolet light of 2537 Γ were found to be 0.49 and 0.11 respectively. Ergosterol is not formed from tachysterol~2~ during irradiation but originates exclusively fr
## 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