In the absence of adverse steric effects, ferrocenylalkylium ions of the type FcC+(R)CH(Ph)Me (Fc = ferrocenyl) undergo preferential exo-deprotonation upon reaction with a base and a similar exo-stereoselectivity is associated with protonation of the resulting alkenes FcC(R)![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C(Ph)Me in trifluoroacetic acid.
C. A. Bunton, W. Crawford, N. Cully and W. E. Watts, J. Chem. Soc., Perkin Trans. 1, 1980, 2213 DOI: 10.1039/P19800002213
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