Facile Synthesis of Complicated 9,9-Diarylfluorenes Based on BF3·Et2O-Mediated Friedel−Crafts Reaction

BF3·OEt2-mediated Friedel−Crafts reaction of 9-phenyl-fluoren-9-ol with electron-rich aromatic substrates to prepare a new family of complicated 9,9-diarylfluorenes is described. The 9,9-diarylfluorenes tethered with various functional substituents, e.g., bulky spiro units, hole-transporting moieties, and fluorescent dyes, will be promising building blocks for the construction of optoelectronic materials.