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Intramolecularly stabilized silyl cation I and its non‐stabilized isomer II. Relevant NMR parameters of triaryl silylium ion 1, of selenylether‐stabilized cation 2 c and their complexes with OPEt3 [Δδ 31P NMR of the OPEt3 complex relative to that of OPEt3 (δ 31P=46.2)].
