While the norbornen-7-ylium cation dissolved in liquid SO2 does not undergo 7-substitution with PPh3, the analogous reaction with the 7-methoxynorbornen-7-ylium cation produces the 7-methoxynorbornen-7-yl-triphenylphosphonium cation; the intermediate 7-triphenylphosphonio-norbornen-7-ylium dication could be detected.
P. Schipper, W. A. M. Castenmiller, J. W. de Haan and H. M. Buck, J. Chem. Soc., Chem. Commun., 1973, 574 DOI: 10.1039/C39730000574
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