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. Author manuscript; available in PMC: 2019 Mar 14.
Published in final edited form as: Chem Rev. 2018 Feb 5;118(5):2554–2592. doi: 10.1021/acs.chemrev.7b00457

Figure 24.

Figure 24

UV–vis spectroscopic changes upon titration of 0.2 mM 26 (green line) with Me4Im to generate 29 in 3:1 CH2Cl2-MeCN at −85 °C (red line).229 Inset: plot showing the change in absorbance at 705 nm vs concentration of added Me4Im. The pKa of 26 is estimated to be 0.3 units higher than that of the conjugate acid of Me4Im. Reproduced from ref 229 with permission. Copyright 2014 American Chemical Society.