Table 1.

Physicochemical characteristics of synthesized benzimidazole derivatives.

Comp.	R1	R2	R3	R4	R5	X	Mol. Formula	Mol. Wt.	m.p.	Rf value (CHCl3)	Yield %
1	NH2	H	H	H	H	C O	C20H15N3O4S	393.42	116–-118	0.33	70.9
2	H	H	H	H	H	C O	C20H14N2O4S	378.40	93–95	0.49	43.9
3	H	H	NH2	H	H	C O	C20H15N3O4S	393.42	212–-214	0.43	99.0
4	Cl	H	H	H	H	C O	C20H13ClN2O4S	412.85	128–-130	0.48	37.5
5	H	H	Cl	H	H	C O	C20H13ClN2O4S	412.85	65–-67	0.44	63.5
6	H	OH	H	H	H	C O	C20H14N2O5S	394.40	98–-100	0.41	101.6
7	OH	H	OH	H	H	C O	C20H14N2O6S	410.40	163–-165	0.38	70.6
8	H	H	OCH3	H	H	C O	C21H16N2O5S	408.43	90–92	0.36	60.9
9	H	H	NO2	H	H	C O	C20H13N3O6S	423.40	92–-94	0.34	46.3
10	CH3	H	H	H	H	C O	C21H16N2O4S	392.43	70–72	0.35	37.0
11	H	H	CH3	H	H	C O	C21H16N2O4S	392.43	95–97	0.45	28.1
16	OH	H	H	H	H	C O	C20H14N2O5S	394.40	78–-80	0.77	60.0
20	H	H	CH3	H	H	SO2	C20H16N2O5S2	428.48	156–-158	0.40	35.8
	R
12	–CH CH–CH3						C17H14N2O4S	342.37	112–-114	0.82	30.2
13	–CH CH2						C16H12N2O4S	328.34	100–102	0.56	32.8
14	–C(CH3) = CH2						C17H14N2O4S	342.37	102–-104	0.43	33.5
15							C19H13N3O4S	379.39	110–-112	0.96	44.0
17	–CH2–(CH2)2–CH3						C18H18N2O4S	358.41	107–-109	0.42*	33.8
18	–CH2–(CH2)6–CH CH–(CH2)7–CH3						C31H42N2O4S	538.74	109–111	0.75	31.7
19	–CH2–(CH2)13–CH3						C29H40N2O4S	512.70	115–117	0.83*	61.3

*TLC mobile phase – Benzene.