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Studies on vitamin D and related compounds XI investigations on sterols XIII the photoisomerisation of ergosterol

✍ Scribed by M. P. Rappoldt; E. Havinga

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
594 KB
Volume
79
Category
Article
ISSN
0165-0513

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πŸ“œ SIMILAR VOLUMES

Investigations on sterols XIV studies on
Investigations on sterols XIV studies on vitamin D and related compounds XII the photoisomerization of lumisterol2
✍ M. P. Rappoldt πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 328 KB

## 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 compoun
Studies on vitamin D and related compounds XIV Investigations on sterols XVII: The photoisomerization of pre-ergocalciferol and tachysterol2
✍ M. P. Rappoldt πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 389 KB

## Abstract The quantum yields of the isomerizations of pre‐ergocalciferol 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

Studies on vitamin D and related compoun
Studies on vitamin D and related compounds IX: Remarks on the iodine-catalyzed isomerisations of vitamin D and related compounds
✍ A. Verloop; A. L. Koevoet; R. van Moorselaar; E. Havinga πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 393 KB

## Abstract Details on the iodine‐catalyzed reactions of previtamin D, tachysterol, __cis‐__ and __trans__‐vitamin 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

Studies on vitamin D and related compoun
Studies on vitamin D and related compounds. XVI: Synthesis of model compounds for the study of the previtamin D ⇋ vitamin D interconversion
✍ J. L. M. A. Schlatmann; E. Havinga πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 693 KB

## Abstract The syntheses are described of previtamin D ‐ and vitamin D analogues to be used for the study of the thermal precalciferol ⇋ calciferol isomerization reaction. A previtamin D analogue (4) prepared as indicated by Inhoffen could not be obtained in a pure state. Closer inspection reveal