Photochemische Reaktionen. 76.Mitteilung [1]. UV.-Bestrahlung von 11-Oxo-Steroiden V Die Photoisomerisierung von 3,20-Diäthylendioxy-5α,14β,17α-pregnan
✍ Scribed by Peter Gull; Yoshihisa Saito; Hansuli Wehrli; Oskar Jeger
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- German
- Weight
- 701 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
The UV.‐isomerisation of 11‐oxo‐14β,17α‐pregnane 9 to the 11,19‐cyclo‐derivative 11 is described. In addition the Pb(OAc)~4~‐fragmentation of photoproduct 11 was investigated. 11 yielded besides the expected 11‐oxo‐19‐hydroxy‐pregnane 18 the novel 9,11‐seco‐11,19‐cyclosteroid 19. The structure of 19 was established by chemical transformations and subsequently confirmed by X‐ray analysis [2].
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## Abstract On UV.‐irradiation in __i__‐octane the α,β‐unsaturated ketone **14** is transformed into a mixture of **15** and **16**.
Vakuum bei 150" vollstandig in 4 uberfuhrt, welches sich im direkten Vergleich als mit dem Naturprodukt identisch erwiesl).