Unprecedented Ring Transformation of an α,α′-Monosubstituted 2,4,5-Triphenylpyrylium Salt with η3-Phosphines: Efficient Synthesis of Aryl- and Alkylphosphonium Triphenylcyclopentadienylides
摘要:
The ring transformation of the alpha reactive 2 4 5 triphenylpyrylium salt 1 with eta(3) phosphines to the aryl and alkylphosphonium triphenylcyclopentadienylides 5 is reported The mechanism of this unprecedented transformation might involve tandem conjugate addition and intramolecular Wittig cyclization