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Synthesis and properties of triply-bridged syn-carbazolophanes
Yosuke Nakamura1, Masayoshi Kaneko, Keita Tani
1Department of Chemistry, Gunma University, Tenjin-cho, Kiryu, Gunma 376-8515, Japan. nisimura@chem.gunma-u.ac.jp
The Journal of Organic Chemistry
|November 26, 2002
Abstract:
The intramolecular [2 + 2] photocycloaddition of alpha,omega-bis(3,6-divinyl-N-carbazolyl)alkanes 3 afforded triply bridged syn-[2.2.n](3,6,9)carbazolophanes 4a-6a (n = 4) and 4b,5b (n = 5) composed of isomers derived from the difference in the direction of cyclobutane rings. In major isomers 4a and 4b, excimer fluorescence was observed, the maximum position remarkably depending on the tether length.