The Ullmann amination reaction was utilized to provide access to a number of fluorene analogues from common intermediates, via facile functionalization at positions 2, 7, and 9 of the fluorene ring. Through variation of amine or iodofluorene derivative, analogues bearing substitutents with varying electron-donating and electron-withdrawing ability, eg, diphenylamino, bis-(4-methoxyphenyl) amine, nitro, and benzothiazole, were synthesized ...
