Synthesis and Structure of Benzotriazolyl Fluorenes

1-(Fluoren-2-yl)-benzoled][1,2.3]triazoles 5a-b were synthesized starting from 2-nitrofluorene 2-Nitrofluorenes la-b were reduced by catalytic hydrogenation, reacted with 2,4-dinitrofluorobenzene followed by catalytic hydrogenation to afford 2-(N-2,4-diaminophenyl)aminofluorenes 4a-b. Diazotization of 4a-b with NaNO2/H2SO4 followed by treatment with H3PO2 gave 5a-b Sulfonation of 5a-b yielded 7-benzotriazol-l-yl-fluorene-2-sul Ionic acids 6a-b The structures of 5b and 6b were firmly identified by X-ray crystal analysis in addition to H-1 NMR, C-13 NMR, and elemental analysis.