Table 15: Physical and IR Spectroscopic data of the 1-(2-cyanophenyl-)4-(2-aryl-1-diazenyl-)piperazine series (19).

Series
#
KS# X %
yield
m.p.
°C
Recr. Solv. Crystal
appearance
IR
cm.-1
19a KS72 p-CO2CH3 87 130 - 131 Ethanol Lustrous
yellow
needles
755
1714
2228
OOP
C=O
C≡N
19b KS75 p-CH2 91 107- 108 Cyclohexane Chunky pink
needles
769
822
2224
OOP
OOP
C≡N
19c KS74 p-Br 96 104.9- 105.3 Ethanol Off-white
plates
755
2221
OOP
C≡N
19d KS76 p-OCH3 36 130- 131 Ethanol Metallic buff
needles
765
828
1247
2218.5
OOP
OOP
C–O
C≡N