Effat Samiei - Department of Chemistry,Islamic Azad University Ayatollah Amoli,Amol, Iran
Seyed Mohammad Vahdat - Department of Chemistry,Islamic Azad University Ayatollah Amoli,Amol, Iran
Saeed Baghery - Young Researchers Club,Islamic Azad University Ayatollah Amoli,Amol, Iran

In thispaper, we introduce two nonconformist ionic liquid [MIMPS](3)PW(12)O(40) and[TEAPS](3)PW(12)O(40) as a green solid acid catalysts for the highly efficient and green synthesis of2-substituted and 1,2-disubstituted benzimidazole derivatives via the one-pot condensation of1,2-phenylenediamine and various aromatic aldehydes.Various aromatic aldehydes were utilized in the reaction and in all situations the desired product were synthesized successfully.This reaction has been carried out in the presence of 1 mol% of catalysts in water at room temperature. The reusability of the catalysts was demonstrated by a five-run test. The described novel synthesis method propose several advantages of safety, short reaction times, mild condition, high yields, simplicity and easy workup compared to the traditional synthesis method.

Heteropolyacid salt; Ionic liquid; Green solid acid catalyst;2-Substituted benzimidazole; 1,2-Disubstituted benzimidazole;Water solvent