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Photochemistry of ethenobenzocycloheptenones : A Di-π-methane rearrangement of β,γ-unsaturated aryl ketones

✍ Scribed by Alfred Hassner; David Middlemiss; Judith Murray-Rust; Peter Murray-Rust

Publisher
Elsevier Science
Year
1982
Tongue
French
Weight
655 KB
Volume
38
Category
Article
ISSN
0040-4020

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## Abstract The irradiation of 17β‐acetoxy‐4‐oxa‐1,5‐androstadien‐3‐one (**12**) yielded the two stereoisomeric spiro‐lactones **13** and **14**, which result from a di‐π‐methane photorearrangement. A third product, the oxa‐anthrasteroid **15**, was also isolated (__Scheme 3__).