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 1

Synthesis of 2-arylbenzimidazoles in the presence of PBNS.

Entry	OPD	Aldehyde	Product^a	Time (min)	Yield (%)^b	M. P. (°C); Reported	M. P. (°C); Found
1				60	93	286–289 [15]	288–290
2				45	90	263–265 [15]	260–263
3				75	89	231–233 [15]	234–237
4				40	90	275-276 [16]	274–277
5				30	91	157-158 [15]	154–156
6				45	96	204–206 [16]	207–210
7				40	92	301–303 [16]	297–299
8				75	93	286–288 [17]	287–289

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