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. Author manuscript; available in PMC: 2014 Dec 23.
Published in final edited form as: Angew Chem Int Ed Engl. 2013 Nov 8;52(52):10.1002/anie.201306352. doi: 10.1002/anie.201306352

Figure 4.

Figure 4

Calculated minimum energy structures of trans neutral (a) and protonated (b) forms of a model compound representative of 2. (c) Resonance representations showing effects that stabilize the azonium ion.