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. 2019 Sep 23;141(41):16398–16407. doi: 10.1021/jacs.9b07841

Figure 3.

Figure 3

Selection criteria of probes (proton sites) for R: (1) significant change in the chemical environment; (2) free from significant scalar coupling; and (3) free from signal overlap. The selected protons and the corresponding peaks in the 1D 1H spectrum at 600 MHz and 180 K in CD2Cl2 are marked in red (catalyst site) and green (imine site).