137  US 10,007,180 B2  138  TABLE I-continued  Compd.  (A-13)  Compd.  (A-14)  0  303  290  CF3  ~  El  TI  I  0  0-S~  II  F  0  0  CC s+X)~  0  #  Compd.  Chemical formula and structural formula  Comparative compd. (Rl)  Comparative compd. (R2)  Comparative compd. (R3)  Comparative compd. (R4)  Tri-n-octylarnine  2,4,5-triphenylimidazole  The $^{1}$H-NMR chemical shifts of compounds (A-11),  (A-12), (A-10) and (A-9) are listed below.  Compound (A-11)  $^{1}$H-NMR (400 MHz, CDC1$_{3}$ ); 7.80-7.58 (m, 14H), 3.97  (d, lH), 3.78 (d, lH), 3.53 (s, 2H), 3.03 (t, lH), 2.74 (d, lH),  2.66 (t, lH), 2.55 (d, lH), 2.03-0.84 (26H, m).  Compound (A-12)  $^{1}$H-NMR (400 MHz, CDC1$_{3}$ ); 7.80-7.58 (m, 14H), 3.97 65  (d, lH), 3.78 (d, lH), 3.52 (s, 2H), 3.03 (t, lH), 2.62 (t, lH),  2.32 (s, 4H), 1.82-0.84 (18H, m).  Compound (A-10)  $^{1}$H-NMR (d6-DMSO: ppm)  Ii;  1.10-0.88 (2H, m), 1.26- 1.12 (5H, m), 1.74-1.51 (5H, m), 2.28 (s, 4H), 2.81-2.73  (lH, m), 3.18-3.07 (lH, m), 3.52 (s, 2H), 3.65 (lH, d, J=12.8  Hz), 3.81 (2H, s), 7.90-7.64 (m, 14H).  Compound (A-9)  $^{1}$H-NMR (d6-DMSO: ppm)  Ii;  1.17-1.09 (18H, m), 2.28  (s, 4H), 2.81-2.76 (lH, m), 3.52 (s, 2H), 4.61-4.55 (2H, m),  6.94 (2H, s), 7.90-7.64 (m, 14H). 