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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(2008)Doi:10.1021/ja9730223
(1998)Doi:10.1021/ja00253a064
(1987)Doi:10.1021/ja01559a039
(1957)Doi:10.1021/om00153a036
(1987)Doi:10.1021/jo00231a034
(1987)
