An electron-rich olefin [![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
[graphic omitted]R]2(R = Me, Et, or CH2Ph) is an effective catalyst (at < 1 molar % concentration) for the benzoin condensation in aprotic non-polar media; the appropriate 2-aroylimidazolidine is obtained at high dilution under stoicheiometric conditions (olefin + 2ArCHO).
M. F. Lappert and R. K. Maskell, J. Chem. Soc., Chem. Commun., 1982, 580 DOI: 10.1039/C39820000580
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