✦ LIBER ✦
Photochemistry of substituted cycloheptatrienes: change in direction of ring closure on reaction via an upper excited state
✍ Scribed by V.C. Freestone; A.A. Gorman
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- French
- Weight
- 199 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
The light-induced ring closure of cyclohepta.trienes to blcyclo(3,2,O)hepta-2,6-dienes @ + 2) ha.s been extensively studied from the point of view of product analysis. 1-8 In all reported cases the state involved in ring closure is thought to be the lowest excited singlet a.nd for unsymmetrical cyclohepktrienes only one of the two possible bicyclic products is produced. We have interpreted this directional specificity in terms