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. 2012 Nov 1;17(11):12821–12835. doi: 10.3390/molecules171112821

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© 2012 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 3 — The “α-hydroxyphosphonate” mechanism proposed for a Kabachnik–Fields reaction [15,17].