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. 2024 Mar 15;29(6):1319. doi: 10.3390/molecules29061319

Figure 4.

Figure 4

Left: 1H NMR (600 MHz, CDCl3, 25 °C) spectral regions corresponding to ortho-protons of (S)-enantiomerically enriched mixtures of 4 (2.5 mM) and 6 (1 mM) in the presence of 2 equiv of 1-TU and 1 equiv of DABCO, and of (R)-enantiomerically enriched mixture of 9 (1 mM) in the presence of 4 equiv of 1-TU and 2 equiv of DABCO. Right: 1H NMR (600 MHz, CDCl3, 25 °C) spectral regions corresponding to ortho-protons of (S)-enantiomerically enriched mixtures of 4 and 6 (15 mM) in the presence of 1-TU (3 and 1 mM, respectively) and DABCO (15 mM) and of (R)-enantiomerically enriched mixture of 9 (7.5 mM) in the presence of 1-TU (1.5 mM) and DABCO (15 mM).