Table 3: Physical data for series of 1-(2-methylbenzyl)-4-(aryldiazenyl)-piperazines (5).
|
|
Overall |
|
|
Recryst. |
Crystal |
|
No. |
X |
yield |
|
mp(℃) |
Solvent |
IR (cm-1) |
(%) |
|
|
appearance |
|
|
|
|
|
Iso- |
Off-white |
2218(CN) |
5a |
p-CN |
47% |
|
73-74 |
Propanol |
prisms |
840(para) |
|
|
|
745(ortho) |
|
|
|
|
|
Iso- |
Pale pink |
1714(C=O) |
|
|
|
|
|
Propanol |
Needles |
1274(C-O) |
|
|
|
|
|
|
|
859(para) |
5b |
p-CO2CH3 |
52% |
97.5-98.5 |
|
|
746(ortho) |
5c |
p-Br |
35% |
|
65-66 |
Ethanol |
Lustrous |
830(para) |
|
|
Brown plates |
744(ortho) |
|
|
|
|
|
Ethanol |
Red-brown |
1509 & |
|
|
|
|
|
|
Prisms |
1378(NO2) |
|
|
|
|
|
|
|
853(para) |
5d |
p-NO2 |
66.5% |
|
92.5-93 |
|
|
745(ortho) |
|
|
|
|
|
Hexanes |
Fibrous |
693 & 761 |
5e |
H |
72% |
|
71-73 |
(a) |
Pale yellow |
(mono-sub) |
|
|
Prisms |
743(ortho) |