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Photochemical Reactions. 125th communication [1]. Photochemistry of homoconjugated cyclobutanones. I. Synthesis and photolysis of a Spiro [3.6]deca-5, 7-dien-1-one

✍ Scribed by Terry A. Lyle; Bruno Frei

Publisher: John Wiley and Sons
Year: 1981
Tongue: German
Weight: 487 KB
Volume: 64
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19810640816

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✦ Synopsis

Abstract

The title compound 4 was prepared in 54% overall yield from eucarvone (5). On triplet sensitization 4 gives two products resulting from a 1,2‐acyl shift (8 and 9), whereas singlet excitation of 4 causes decarbonylation and ketene elimination (4 → 10 and 11).

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Photochemical reactions. 144th Communica

Photochemical reactions. 144th Communication. Photochemistry of 5,6-epoxy-1,3-dienes in the ionone series: Influence of a methoxy group in position 7

✍ Urs Goldener; Bruno Frei; Oskar Jeger 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 German ⚖ 802 KB

## Abstract On triplet excitation (λ > 280 nm, acetone), the epoxydiene (__E__)‐**5** undergoes initial cleavage of the C(5)O bond of the oxirane and subsequent cleavage of the C(6)C(7) bond leading to the diradical intermediate e which reacts by recombination furnishing the cyclic compounds (__E