Yield: 76%, m.p. 176-178 °C; IR (KBr, cm−1): 3069 (Ar C–H stretch), 2841 (Aliphatic C–H stretch), 1581–1550 selleck chemical (Amidine C N stretch), 1479–1455 (Aromatic C C stretch), 1170 (C–N stretch); 1H NMR (CDCl3, 400 MHz) δ: 3.63 (s, 2H), 2.29–2.5
(broad, 8H, pip), 7.18–7.23 (m, complex, Ar–H), 7.23–7.49 (m, complex, Ar–H). Yield: 69%, m.p. 190–192 °C: IR (KBr, cm−1): 3065(Ar C–H stretch), 2835 (Aliphatic C–H stretch), 1605–1560 (Amidine C N stretch), 1490–1465 (Aromatic C C stretch), 1189 (C–N stretch) 1H NMR (CDCl3, 400 MHz) δ: 4.26 (s, 2H), 2.38–2.74 (broad, 8H, pip), 7.22–7.49 and 7.49–7.6 (m, complex Ar–H). Yield: 72%, m.p. check details 178–179 °C: IR (KBr, cm−1): 3061 (Ar C–H stretch), 2856 (Aliphatic C–H stretch), 1578–1540 (Amidine C N stretch), 1487–1445 (Aromatic C C stretch), 1210 (C–N stretch) 1H NMR (CDCl3, 400 MHz) δ: 4.22 (s, 2H), 3.24–3.29 (8H, pip), 6.97–7.29 (m, complex, Ar–H). Yield: 80%, m.p. 167–169 °C: IR (KBr, cm−1): 3058 (Ar C–H stretch), 2867 (Aliphatic C–H stretch), 1587–1540
(Amidine C N stretch), 1467–1450 (Aromatic C C stretch), 1205 (C–N stretch) 1H NMR (CDCl3, 400 MHz) δ: 3.77 (s, 2H), 2.37–2.73 (8H, pip), 3.5 (s, 3H), 6.98–7.40 (m, complex, Ar–H). Yield: 75%, m.p. 188–191 °C: IR (KBr, cm−1): 3064 (Ar C–H stretch), 2847(Aliphatic C–H stretch), 1597–1550 (Amidine C N stretch), 1479–1450 (Aromatic C C stretch), 1190 (C–N stretch) 1H NMR (CDCl3, 400 MHz) δ: 4.26 (s, 3H), 2.74–3.24 (8H, pip), 3.8 (s, 3H), 7.23–7.6 (m, complex, Ar–H). Yield: 69%, m.p. 156–158 °C: IR (KBr, cm−1): 3064 (Ar C–H stretch), 2847 (Aliphatic see more C–H stretch), 1597–1550 (Amidine C N stretch), 1479–1450 (Aromatic C C stretch), 1190 (C–N stretch); 1H NMR (CDCl3, 400 MHz) δ: 3.66 (s, 2H), 3.23–3.38 (8H, pip), 2.31 (s, 3H), 7.22–7.6 (m, complex, Ar–H). Yield: 78%, m.p. 160–162: IR (KBr, cm−1): 3060 (Ar C–H stretch), 2847 (Aliphatic C–H stretch), 1597–1550 (Amidine C N stretch), 1479–1450
(Aromatic C C stretch), 1190 (C–N stretch); 1H NMR (CDCl3, 400 MHz) δ: 2.21 (s, 2H), 3.24–3.39 (8H, pip), 4.26 (s, 2H), 7.28–7.6 (m, complex, Ar–H). Yield: 55%, m.p. 125–127; IR (KBr, cm−1): 3054 (Ar C–H stretch), 2845 (Aliphatic C–H stretch), 1595–1557 (Amidine C N stretch), 1470–1440 (Aromatic C C stretch), 1179 (C–N stretch); 1H NMR (CDCl3, 400 MHz) δ: 4.26 (s, 3H), 2.74–3.24 (8H, pip), 3.8 (s, 3H), 7.23–7.6 (m, complex, Ar–H). The mice (22–25 g) were divided into twelve groups, each group contain five animals.