References and notes
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A recent report7 claims that M-AM isomerization may occur under strong acidic conditions.
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The scale of stabilities of thiirenium ions, which should be checked by further studies, correlates with the scale of stabilities of cyclopropenium ions.30
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Capozzi, G., Lucchini, V. & Modena, G. Thiirenium ions. Reviews of Chemical Intermediates 2, 347–375 (1979). https://doi.org/10.1007/BF03156004
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DOI: https://doi.org/10.1007/BF03156004