Ethylene- -naphthalenium ions

Other examples of cerium(III)-assisted reductions include reactions of derivatives of biologically active principals from Podocarpus plants (Hayashi and Matsumoto, 1982), and the preparation of precursors of stable carbocations derived from a-ethylene naphthalenium ions (Olah and Singh, 1982) ... 

It was also possible to prepare stable ethylene-(4-X)-naphthalenium ions 115 (X= Me, Ph, OMe) and 9,9-ethylene-(10-X)-anthracenium ions 116 (X = H, Br) under long-lived stable ion conditions114. 

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See also in sourсe #XX -- [ ]

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