Table 4: Physical data for series of 1-(3-methylbenzyl)-4-(aryldiazenyl)-piperazines (6).

Crude Recryst. Crystal
No. X yield mp(℃) appearance IR (cm-1)
(%) Solv.
6a Pale orange 2220(CN)
p-CN 90% 105-106 iso-propanol Needles 841(para)
783 and 696(meta)
6b Lustrous 1710(C=O)
Flesh-colored 860(para)
p-CO2CH3 93% 82-83 ethanol Plates 775 & 698 (meta)
6c Tiny buff 829(para)
p-Br 87% 77-78 Iso-propanol Colored
Needles 777 & 695 (meta)
6d Pink 823(para)
p-CH3 62% 85-86 Iso-propanol Needles 781 & 696 (meta)
Tiny 1514 &
6e Red-brown 1376(NO2)
Needles 853(para),
p-NO2 94% 82-83 Iso-propanol 781 & 694(m)