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. 2020 Mar 19;85(8):5342–5350. doi: 10.1021/acs.joc.0c00027

Table 2. Effect of 1 equiv of Base on 1H NMR (600 MHz, CDCl3, 25 °C) Nonequivalences (ppm) for 5 (30 mM) in the Presence of 1 equiv of 1-TU.

  base
proton DABCO DMAP NBu4+
o-DNB 0.129 0.140 0.088
p-DNB 0.079 0.081 0.052
NH 0.010 0.040 0.028
CH 0.034 0.009 0.022