𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Photochemical reactions. 134th Communication. Photochemistry of 5,6-epoxy-5,6-dihydro-3,4-methano-β-ionone: Influence of a cyclopropane ring on the reactivity of an ylide intermediate

✍ Scribed by Norbert Bischofberger; Bruno Frei; Oskar Jeger

Publisher
John Wiley and Sons
Year
1984
Tongue
German
Weight
785 KB
Volume
67
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Photochemical Reactions. 128th Communica
Photochemical Reactions. 128th Communication. Isolation of a Thermally Labile 2,8-Dioxabicyclo[3.2.1]oct-3-ene Intermediate on Photolysis of 3,4: 5,6-Diepoxy-5,6-dihydro-β-ionone
✍ Norbert Bischofberger; Bruno Frei; Oskar Jeger 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 German ⚖ 372 KB 👁 1 views

## Abstract Photolysis (λ = 254 mm, THF) of the diepoxyenone (__E__)‐**1** at −78° leads to the 2,8‐dioxabicyclo[3.2.1]oct‐3‐ene intermediate **3** (51%). At ambient temperature **3** undergoes an unexpectedly rapid electrocyclic opening to the triketone **2** in quantitative yield. Compound **3**

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

Photochemical reactions. 132nd communica
Photochemical reactions. 132nd communication. Photochemistry of 5,6-epoxy-5,6-dihydro-7-methyl-β-ionine: Influence of a methyl group at the enone side chain on the oxirane cleavage
✍ Antoni Siewnski; Barbara Henggeler; Hans Richard Wolf; Bruno Frei; Oskar Jeger 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 German ⚖ 588 KB

In, n \*-Excitation of the y, 6-epoxy-enone (E)-3 leads exclusively to the conformers (%)-3A + B. On 'n, n\*-excitation of (E)-3, in addition to (%)-3A + B, products &9 arising from a carbene intermediate e are formed. However. products of an isomerization via C(y),O-bond cleavage of the oxirane wer