Tetrahedron Letters p. 5501 - 5504 (1988)
Update date:2022-09-26
Topics:
Wilcox, C.F.
Hellwinkel, D.
Stahl, H.
Gaa, H.G.
Doerner, M.
Relative to their neutral precursors, highly charged multi-tritylium ions show typical downfield 1H-NMR shifts, whereas the corresponding phenylfluorenylium ions show upfield shifts.A Hueckel based model is presented that accounts for this contrasting behavior in terms of antiaromatic ring current in the five-membered ring of the fluorenyl system with essentially null ring currents in the two six-membered rings.
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