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Triplet-sensitized interconversion and photooxygenation of Vitamin D and trans-Vitamin D

✍ Scribed by J. W. J. Gielen; R. B. Koolstra; H. J. C. Jacobs; E. Havinga

Book ID
104588259
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
734 KB
Volume
99
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

Triplet‐sensitized irradiation of either Vitamin D or __trans__Vitamin D establishes a photo‐equilibrium between the two isomers, the position of which varies with the triplet energy of the sensitizer. In the presence of oxygen, selective photooxygenation of trans‐Vitamin D takes place. The applicability of sensitization for the preparation of cis‐ and trans‐Vitamin D and derivatives thereof is shown.

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✍ 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