Les 反应 sont 意识到 dans le dichloro-1,3 苯。L'orientation 取决于 beaucoup des substituants portes par la double liaison acrylique。Pour la Premiere fois on observe un mode tete-tete pour la cycloaddition thermique [2+2] de 2 unites acryliques
A Note on Intramolecular Photochemical Cycloaddition of<i>N</i>-substituted Dimethacrylimides
作者:Alex Alder、Niklaus Bühler、Daniel Bellus
DOI:10.1002/hlca.19820650805
日期:1982.12.15
The intramolecularphotochemical [2+ 2]-cycloaddition of N-substituted dimethacrylimides 1a and 1c, respectively, proceeds under conditions of direct irradiation (λ = 254 nm) as well as triplet photosensitization highly regioselectively yielding predominantly the «cross» bonding (head-to-tail) cycloadducts 3a and 3c, respectively, with a 3-azabicyclo [3.1.1]heptane ring system.