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. 2011 Jan 10;16(1):442–465. doi: 10.3390/molecules16010442

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© 2011 by the authors;

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Scheme 2 — Chatt’s reaction mechanism. The most likely reaction path is highlighted with red arrows. Reaction free energies calculated considering HBF₄ in Et₂O as proton source are reported, while, in parenthesis, free energies calculated considering lutidinium as proton source are also given.