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Brønsted Acid-Catalyzed Intramolecular Hydroarylation of β-Benzylstyrenes.

  • Author(s): Cai, Xiao
  • Keshavarz, Amir
  • Omaque, Justin D
  • Stokes, Benjamin J
  • et al.
Abstract

Using triphenylmethylium tetrakis(pentafluorophenyl)borate as a convenient Brønsted acid precatalyst, β-(α,α-dimethylbenzyl)styrenes are shown to cyclize efficiently to afford a variety of new indanes that possess a benzylic quaternary center. The geminal dimethyl-containing quaternary center is proposed to be necessary to arm the substrate for cyclization through steric biasing.

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