フルオレン骨格の合成反応

抄録

Fluorene is one of interesting compounds in organic synthesis, owing to its active methylene group. In this paper, the articles dealing with the preparation of fluorenes by the ring closure of five-membered ring from biphenyl, diphenylmethane, and benzophenone derivatives, and by the ring degradation from phenanthrene, fluoranthene, and cyclopenta [def] phenanthrene were reviewed.