Self-Sensitized Photooxygenation of a C60-Cycloheptatriene Dyad to Form Norcaradiene-Derived Endoperoxides
作者:Masaaki Hanamura、Jun Kamada、Akiyo Amano、Ken'ichi Takeuchi、Takao Okazaki、Katsuyuki Hirai、Toshikazu Kitagawa
DOI:10.1002/ejoc.200901453
日期:2010.6
strong photosensitizing ability of the fullerene cage and to the valence isomerization of 1 to the norcaradiene form, which was facilitated by the bulky tert-butyl groups. Competitive oxygenation of 1 and a related cycloheptatriene lacking the fullerenyl group (2) resulted in the formation of endoperoxides of the two molecules in comparable yields. This result demonstrates that the cycloaddition is not
[60] 富勒烯-环庚三烯二元组 1 很容易在环庚三烯部分进行分子氧的 [4+2] 环加成反应,得到内过氧化物 5-exo 和 5-endo。通过添加 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO)(一种有效的单线态氧猝灭剂)完全抑制氧化,证实了单线态氧的参与。观察到的容易氧化归因于富勒烯笼的强光敏能力和 1 到降卡二烯形式的价异构化,这是由庞大的叔丁基促进的。1 和缺乏富勒烯基的相关环庚三烯 (2) 的竞争性氧化导致两种分子的内过氧化物以相当的产率形成。