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Free 1‐Phenylallyl Cations in the Aromatisation of Dihydronaphthalenes by Triphenylmethyl Tetrafluoroborate The aromatisation of 1,2‐ and 1,4‐dihydronaphthalenes by trityl cations proceeds by a common intermediate, the 1‐phenylallyl cation 4 of sufficient lifetime to allow for both side reactions and loss of stereoselectivity. The primary hydride abstraction occurs with moderate tunneling participation and in a linear geometry of the three participating atoms as shown by the temperature dependence of the primary isotope effect.
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Giese et al. (1990) studied this question.
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