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. Author manuscript; available in PMC: 2020 Nov 6.
Published in final edited form as: J Am Chem Soc. 2019 Oct 28;141(44):17909–17917. doi: 10.1021/jacs.9b09671

Figure 2.

Figure 2.

(a) Change in the absorption spectra upon stepwise addition of Zn(OTf)2 to 3a in CH2Cl2/CH3CN (1/1, v/v); (b) Plot of the absorbance at 392 nm versus the amount of Zn(OTf)2.