Figure 2.

Substituted-(phenyl-diazenyl) phenols derivatives (4a–m).

	R1	R2	R3	R4	R5
4a	O(CH2)3CH3	H	CH3	OH	CH3
4b	OCH2CH(CH3)2	H	CH3	OH	CH3
4c	OCH2C(CH3)3	H	CH3	OH	CH3
4d	OCH2CH2CH(CH3)2	H	CH3	OH	CH3
4e	OCH2CH(CH2CH3)CH2(CH2)2CH3	H	CH3	OH	CH3
4f	H	H	CH3	OCH3	CH3
4g	OCH2CH(CH3)2	OH	H	OH	H
4h	OCH2C(CH3)3	OH	H	OH	H
4i	OCH2CH2CH(CH3)2	OH	H	OH	H
4j	OCH2CH(CH2CH3)CH2(CH2)2CH3	OH	H	OH	H
4k	OH	OH	H	OH	H
4l	CH3	OH	H	OH	H
4m	OCH3	OH	H	OH	H