Synthesis and Characterization of a Series of 1-Aryl-4-[Aryldiazenyl]-piperazines. Part II1. 1-Aryl-4-(2-Aryl-1-Diazenyl)-piperazines with Fluoro-, chloro-, Methyl-, Cyano- and Acetyl Substituents in The 1-Aryl Group

Table 23: Summary of ¹H NMR spectroscopic data of the 1-(2-pyridyl)-4-(2-aryl-1-diazenyl)-piperazine series (18).

Series #	X	Aromatic (8H)		H_a (4H)	H_b (4H)	J_ab (Hz)	X
Series #	X	2-Py Ring	Aryl Ring	H_a (4H)	H_b (4H)	J_ab (Hz)	X
18a	p-NO₂	6.70 - 6.73 (2H, m), 7.53 - 7.57 (1H, m), 8.21 - 8.24 (1H, m)	7.54 (2H, d, J=9.0), 8.23 (2H, d, J=9.0)	3.83 (br t)	4.07 (t)	5.2	---
18b	p-CN	6.70 - 6.73 (2H, m), 7.53 (1H, d, J=8.6), 8.24 (1H, dd, J=1.1, 4.9)	7.52 (2H, d, J=8.6), 7.63 (2H, d, J=8.7)	3.82 (br t)	4.03 (t)	5.4	---
18c	3-py	6.68 - 6.69 (1H, m), 6.72 (1H, d, J=8.7), 7.52 - 7.55 (1H, m), 8.23 (1H, dd, J=1.2, 4.9)	7.27 - 7.29 (1H, m), 7.77 (1H, d, J=8.3), 8.42 (1H, dd, J=1.6, 4.8), 8.72 (1H, d, J=2.3)	3.80 (t)	3.99 (t)	5.4	---
18d	p-CO₂CH₃	6.69 - 6.70 (1H, m), 6.72 (1H, d, J=8.9), 7.53 - 7.56 (1H, m), 8.24 (1H, dd, J=1.1, 4.9)	7.51 (2H, dd, J=1.8, 8.7), 8.04 (2H, dd, J=1.8, 8.7)	3.81 (br t)	4.01 (t)	5.4	3.92 (3H, s)
18e	p-COCH₃	6.69 - 6.70 (1H, m), 6.72 (1H, d, J=8.6), 7.54 - 7.56 (1H, m), 8.24 (1H, dd, J=1.2, 4.9)	7.52 (2H, d, J=8.5), 7.97 (2H, d, J=8.7)	3.81 (br t)	4.02 (t)	5.3	2.60 (3H, s)
18f	p-CH₃	6.67 - 6.70 (1H, m), 6.72 (1H, d, J=8.6), 7.52 - 7.55 (1H, m), 8.24 (1H, dd, J=1.1, 5.0)	7.17 (2H, d, J=8.1), 7.39 (2H, d, J=8.4)	3.78 (br t)	3.91 (t)	5.4	2.36 (3H, s)
18g	o-Br	6.68 - 6.70 (1H, m), 6.72 (1H, d, J=8.6), 7.52 - 7.56 (1H, m), 8.24 (1H, dd, J=1.2, 4.9)	7.03 - 7.06 (1H, m), 7.26 - 7.29 (1H, m), 7.46 (1H, d, J=8.0), 7.61 (1H, d, J=7.9)	3.81 (br t)	4.02 (t)	5.4	---
18h	H	6.68 - 6.70 (1H, m), 6.72 (1H, d, J=8.5), 7.54 (1H, m), 8.24 (1H, dd, J=1.1, 4.7)	7.21 (1H, t, J=7.3), 7.37 (2H, t, J=7.9), 7.48 (2H, d, J=8.4)	3.79 (t)	3.95 (t)	5.4	---