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. Author manuscript; available in PMC: 2012 May 10.
Published in final edited form as: J Am Chem Soc. 2010 Nov 11;132(48):17118–17129. doi: 10.1021/ja1045428

Figure 1.

Figure 1

UV-Vis spectral changes upon titration of 1 with m-CPBA in MeOH. Red solid line: 0 equiv.; red dashed line: 1 equiv.; green dashed line: 2 equiv. to form 3; blue solid line: 3 equiv. to form 4.