The conformational change of the s-cis, s-trans-9, 9′: 9′, 9 ″-terfluorenyl to the s-cis, s-cis form via the radical process was performed by means of a reaction with N-bromosuccinimide and with various oxidizing agents. A reverse change occurred on treatment with lithium aluminum hydride and with sodium bis (2-methoxyethoxy) aluminum hydride.
![[9,9'-Bi-9H-fluoren]-9-ol Structure](https://image.chemsrc.com/caspic/188/981-46-4.png)