Photolysis of benzo[a]spiro [2,5]octa-1,4-dien-3-one derivative 8a afforded spiro-fused tetracycles 10 as a pair of diastereomers in 1.7:1 ratio. The photochemical process occurred by cycloaddition of the intermediate-sulfone stabilized biradical 9 to the tethered olefin. Photolysis of dienone 8b ga
Direct Formation of a Substituted [5.5.5.5]Fenestrane by Intramolecular Arene-Olefin Photocycloaddition
✍ Scribed by Jürg Mani; Stefan Schüttel; Cong Zhang; Peter Bigler; Christian Müller; Reinhart Keese
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- German
- Weight
- 433 KB
- Volume
- 72
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
COLOC results.
8 )
Heteronuclear NOE.
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Pyrrolizidine alkaloids have been isolated from a variety of plant families.' In addition they have been found in several species of butterflies and moths2 and in a millipede.3 The pharmacology of these alkaloids has been studied extensively 134 and dangers to human health recognized. 4b,5 Recently,