Polymer supported sulphanilic acid – A novel green heterogeneous catalyst for synthesis of benzimidazole derivatives

Tarpada, Umesh P.; Thummar, Bhautik B.; Raval, Dipak K.

doi:10.1016/j.jscs.2012.07.014

Cited by 14 publications

(1 citation statement)

References 37 publications

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“…Few mixed oxides have been reported for synthesis of benzimidazole derivatives as solid acid catalyst. From literature review heterogeneous mixed oxides were used as a catalyst, such as: RuO2-MoO3 [34], clay supported titanium [35], SiO2-Pr-SO3H [36], SBA-Pr-SO3H [37], yttriazirconia [38], ceria-yttria [39], polymer supported sulphanilic acid [40], Yb (OTf)3 [41], and MoO3/CeO2-ZrO2 [42], as a green heterogeneous catalyst with good catalytic activity for the synthesis of benzimidazole derivatives.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Nanocrystalline Copper Based on MoO3/SiO2 as an Efficient Catalyst for Acylation of Amines

Dagade

Deshmukh

2018

Bull. Chem. React. Eng. Catal.

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Various loadings of copper supported on MoO3/SiO2 (CMS) were prepared by sol-gel method and used for the synthesis of substituted benzimidazole. Further it was characterized by using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), Transmission Electron Microscopy (TEM), and acidity measurement by potentiometric method. XRD results indicated that Cu is present on the support primarily as CuO. The SEM and TEM results showed dispersion of cubic CuO nanoparticles on the surface. These mixed oxides were studied for the acylation of o-phenylene diamine with acetic acid in liquid phase. 10 wt. % CMS gave best results at 110 ºC with 94.81 % conversion of ophenylene diamine and 100 % selectivity of substituted benzimidazole. Different parameters were studied for optimization of acylation, such as: temperature, acylating agents, solvents, amount of catalyst, and different catalysts. The CMS catalyst could also be recovered and reused at three times without any discernible decrease in its catalytic activity.

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