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Polar [4+2]- and [4+4]-Photocycloadditions: Effects of Hybridization in Diradicals

✍ Scribed by Univ.-Doz. Dr. Gerd Kaupp; Heinz-Willi Grüter

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
245 KB
Volume
18
Category
Article
ISSN
0044-8249

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Intramolecular [2 + 2] photocycloadditio
Intramolecular [2 + 2] photocycloaddition, 4. Synthesis of [4.n]cyclophanes by [2 + 2] photocycloaddition and birch reduction. A rare fragmentation of tetramethylene radical anion
✍ Nishimura, Jun ;Ohbayashi, Akihiro ;Ueda, Eiji ;Oku, Akira 📂 Article 📅 1988 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 305 KB 👁 1 views

4.n]Metacyclophanes 6 (n = 2 -6), [4.n]paracyclophanes 7 (n = 3 -6), [4~1](4,4')biphenylophanes 8 (n = 3, 4), and C2.3.2.41paracyclophane 9 were obtained from appropriate 1,2-ethano-[2.n]cyclophanes 1 -5 by Birch reduction. Some strained cyclophanes, like la, lb, and 2a, gave linear open-chain compo