✦ LIBER ✦
Photochemical reactions. 133rd Communication. Photochemistry of epoxydienes of the ionone series: Influence of a methyl group at the diene side chain on the oxirane cleavage
✍ Scribed by Alfons Pascual; Takehiko Nishio; Bruno Frei; Oskar Jeger
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- German
- Weight
- 431 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
On triplet excitation (h > 280 nm, acetone), the epoxydiene (E)-2 undergoes ( E ) / (Z)-isomerization exclusively, leading to the conformers (Z)-2A and (Z)-2B. On singlet excitation (h = 254 nm), apart from ( Z ) -2 A + B, the cyclobutenes 3 A + B are formed.
However, the epoxydiene (E)-2 does not undergo reactions leading to carbene and C,O-bond cleavage products, which are normally observed on singlet and triplet excitation, respectively, of the epoxydienes of the ionone series. ') 132nd Communication, see [I].