Unprecedented Ring Transformation of an α,α′-Monosubstituted 2,4,5-Triphenylpyrylium Salt with η<sup>3</sup>-Phosphines: Efficient Synthesis of Aryl- and Alkylphosphonium Triphenylcyclopentadienylides
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The ring transformation of the α-reactive 2,4,5-triphenylpyrylium salt 1 with η3-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.
创建时间:
2016-02-24



