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. Author manuscript; available in PMC: 2013 Apr 23.
Published in final edited form as: Angew Chem Int Ed Engl. 2012 Feb 29;51(17):4204–4208. doi: 10.1002/anie.201109149

Figure 3.

Figure 3

a) 1H NMR of model compound 2 in comparison with 13C-DPD (4) at pH 1 and pH 7. b) 13C NMR of model compound 3 at pH 1 and pH 7. c) The proposed mechanism for the reaction of the monoketone species with 1,2-phenylenediamine.