## 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
Studies on vitamin D and related compounds XX. The conformation of tachysterol; N.O.E. and 220 Mhz N.M.R.
β Scribed by J. Lugtenburg; E. Havinga
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- French
- Weight
- 163 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Although many stereochemical features of vitamin D and its ieomeric precursor6 may be coneidered rather well established (1,2) by now, there remain a few intriguing questions. One of the problems that asked for further study, is concerned with the conformational analysis of tachyeterol (Fig. I). The first suggestion made upon the
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 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