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 6: Summary of physical and IR spectroscopic data of the 1-(4-acetophenyl)-4-(2-aryl-1-diazenyl)-piperazine series (17).

Series #	X	% Yield	M.P. (°C)	Recr. Solv.	Crystal Appearance	IR (cm^-1)
17a	p-CO₂CH₃	98	235.3 - 236.1	Ethanol	Yellow prisms	OOP C=O ester C=O ketone C-O ester	861 1706 1664 1280
17b	p-Br	93	231.6 - 232.4	Ethanol	Pale yellow prisms	OOP C=O ketone	837 1659
17c	p-CH₃	65	193.7 - 194.6	Ethanol	Lustrous pink plates	OOP C=O ketone	847 1674
17d	p-NO₂	90	217-218	Ethanol	Fine rusty- red needles	C═O ketone Nitro group OOP	1665 1513 & 1337 861
17e	p-CN	90	150-165	-	Amorphous brown clumps	C≡N C═O ketone OOP	2222 1658 843
17f	p-CO₂Et	93	177-178	Ethanol	Fine Lemon- yellow prisms	C═O ester C═O ketone C―O OOP	1705 1664 1282 859
17g	H	94	179-180	Ethanol	Fine pale yellow plates	C═O ketone OOP para OOP mono	1673 817 771