Appendix A.1.2. Product Salt 3MPEA-3DPPA

**1H-NMR** (373.1 K, DMSO-d6, 500.13 MHz, δ in ppm): 7.32–6.74 (m, 14H, Ar H), 5.16 (s, 3H, NH3 <sup>+</sup>), 4.46 (t, *J* = 7.8 Hz, 1H, CH), 4.01 (q, *J* = 6.7 Hz, 1H, CH), 3.76 (s, 3H, O–CH3), 2.97 (d, *J* = 7.8 Hz, 2H, CH2), 1.29 (d, *J* = 6.7

Hz, 3H, CH3) **13C-NMR** (373.2 K, DMSO-d6, 125.76 MHz, <sup>δ</sup> in ppm): 172.0 (CO2), 159.0 (Ar), 149.2 (Ar), 143.9 (Ar), 128.5 (Ar), 127.8 (Ar), 127.1 (Ar), 125.5 (Ar), 117.7 (Ar), 111.5 (Ar), 111.3 (Ar), 54.6 (O–CH3), 50.0 (CH), 46.5 (CH), 40.1 (CH2), 24.9 (CH3)
