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 17: Summary of ¹H NMR spectroscopic data of the 1-phenyl-4-(2-aryl-1-diazenyl)-piperazine series (12).

Series #	X	Aromatic (9H)		H_a (4H)	H_b (4H)	J_ab (Hz)	X
Series #	X	Phenyl Ring	Aryl Ring	H_a (4H)	H_b (4H)	J_ab (Hz)	X
12c	p-CH₃	6.92 (1H, t, J=6.2), 7.00 (2H, d, J=7.6) 7.30 (2H, t, J=7.9)	7.16 (2H, d, J=8.1), 7.37 (2H, d, J=8.2)	3.36 (t)	3.92 (t)	5.2	2.35 (3H, s)
12d	p-Br	6.92 (1H, t, J=7.3), 6.98(2H, d, J=7.9), 7.31 (2H, t, J=8.0)	7.34 (2H, d, J=8.8), 7.46 (2H, d, J=8.8)	3.36 (t)	3.95 (t)	5.3	---
12e	p-OCH₃	6.89 - 6.93 (1H, m), 6.99 (2H, d, J=8.1), 7.30 (2H, t, J=7.9)	6.90 (2H, d, J=8.9), 7.44 (2H, d, J=8.9)	3.60 (t)	3.89 (t)	5.2	3.82 (3H, s)
12f	p-COCH₃	6.84 (1H, t, J=7.3), 7.01 (2H, d, J=7.9), 7.26 (2H, t, J=7.9)	7.48 (2H, d, J=8.7), 7.97 (2H, d, J=8.7)	3.39 (br)	3.98 (t)	5.4	2.56 (3H, s)
12g	p-Cl	6.92 (1H, t, J=7.3), 6.98 (2H, d, J=7.8) 7.31 (2H, t, J=8.3)	7.28 - 7.32 (2H, m), 7.40 (2H, d, J=8.7)	3.36 (t)	3.95 (t)	5.3	---
12i	o-Br	6.93 (1H, t, J=7.1), 6.99 - 7.05 (2H, m), 7.26 - 7.32 (2H, m)	6.99 - 7.05 (1H, m), 7.26 - 7.32 (1H, m), 7.44 (1H, d, J=8.1), 7.60 (1H, d, J=7.5)	3.38 (t)	4.04 (t)	5.1	---