Synthesis, Characterization, and Application of Poly(N,N′-dibromo-N-ethylnaphthyl-2,7-disulfonamide) as an Efficient Reagent for the Synthesis of 2-Arylbenzimidazole and 2-Aryl-1-arylmethyl-1H-1,3-benzimidazole Derivatives

Table 2

Synthesis of 1,2-disubstituted benzimidazoles in the presence of PBNS.

Entry	OPD	Aldehyde	Product^a	Time (min)	Yield (%)^b	M. P. (°C); Reported	M. P. (°C); Found
1				65	90	130–132 [18]	131–133
2				75	82	119-120 [19]	119–121
3				80	77	167-168 [20]	170–172
4				80	80	135–137 [18]	136–138
5				95	95	190–192 [18]	187–189
6				70	75	129–131 [18]	128–130

All products were identified by their IR and ¹H NMR spectra.
^bIsolated yields.