Table 3.

¹³C{¹H} NMR nonequivalences (ΔΔδ, ppm, 150 MHz, CDCl₃, 25 °C) for C-NO₂, CONH, COOH and CH-α carbons of (S)-enantiomerically enriched mixtures of substrates 1–7 (15 mM) in the presence of 2 equiv of 1-TU and 1 equiv of DABCO and of (R)-enantiomerically enriched mixture of 8 (7.5 mM) in the presence of 4 equiv of 1-TU and 2 equiv of DABCO.

Sub	ΔΔδ
	COOH	CONH	C-NO2	CH-α
1	0.405	0.377	0.328	0.267
2	0.436	0.403	0.360	0.115
3	0.345	0.269	0.241	0.107
4	0.266	0.183	0.138	0.102
5	0.275	0.266	0.222	0.222
6	0.405	0.367	0.284	0.184
7	0.374	0.314	0.230	0.170
8	0	0.055	0.023	0