Table 3.

Lanthanum chloride-catalyzed synthesis of benzimidazoles

Entry	Diamine	Aldehyde	Product (3a-3q)	Time (h)	Yields (%)
a				2.0	95
b				2.5	88
c				2.0	91
d				2.0	9.0
e				3.0	87
f				2.0	85
g				2.5	92
h				4.0	90
i				3.0	88
j				2.5	86
k				3.0	90
l				2.5	91
m				3.0	87
n				4.0	85
o				3.0	88
p				2.5	86
q				2.5	89