[2]Paracyclo[2]paracyclo[2](1,8)naphthalenophan-9-ene-1,17-diyne, [0]paracyclo[2]paracyclo[0](5,6)acenaphthenophan-7-ene, and [2]paracyclo[2]paracyclo[2](5,6)acenaphthenophan-9-ene-1,17-diyne, were synthesized by intramolecular reductive coupling reaction of the corresponding carbonyl compounds with low-valent titanium reagent. The structures of the compounds were elucidated by NMR analyses, and the transannular π-electronic interactions between two benzene rings were examined on the basis of electronic spectra.
通过分子内还原偶联反应与低价
钛试剂合成了[2]对并环[2]对并环[2](1,8)
萘-9-烯-1,17-二炔、[0]对并环[2]对并环[0](5,6)
苊-7-烯和[2]对并环[2]对并环[2](5、6)
苊-9-烯-1,17-二炔是通过相应羰基化合物与低价
钛试剂的分子内还原偶联反应合成的。通过核磁共振分析阐明了这些化合物的结构,并根据电子能谱研究了两个苯环之间的跨annular π-电子相互作用。