Unexpected One-Pot Method to Synthesize Spiro[fluorene-9,9‘-xanthene] Building Blocks for Blue-Light-Emitting Materials

An unexpected one-pot synthetic approach toward spiro[fluorene-9,9‘-xanthene] (SFX) under excessive MeSO₃H conditions has been developed. The key step involves a thermodynamically controlled cyclization reaction. Blue-light-emitting materials based on SFX building blocks that exhibit high thermal stability have also been synthesized.