In contrast to 9-o-aminoplien~-l-9-fluorenol, which on deamination gave the rearranged product tribenzot r~ pone,~ 9-0-aminophenylfluorene underwent deamination normally, giving the expected indene [1, 2, 3-jk] fluorene, fluoradene. Fluoradene is another example of the strained cyclopentindene ring system and exhibits the properties characteristic of a strained and warped benzene ring, czz., ease of catalytic hydrogenation and oxidation by ...