In this research, a new strategy for synthesis of benzimidazoles via condensing o‐phenylenediamine and substituted aldehydes by adopting prepared sulfated tin oxide as solid heterogenous catalyst in water ethanol system (1:1‐v/v) at reflux condition has been developed. The solid sulfated tin oxide is synthesized and confirmed by XRD, EDS map, SEM images, and FTIR. The reaction is optimized for different solvents and loading of catalyst. The yields of all benzimidazole derivatives are observed in the range of 80–94%. All the synthesized benzimidazoles are analyzed by spectral data. The use of ecologically benign catalyst sulfated tin oxide, solvent system, ample substrate scope with good atom economy, environmental affordability, and easy work up makes this protocol green.

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A novel synthetic approach is formulated for the synthesis of 1,4‐dihydropyridine derivatives via one pot condensation of aromatic aldehydes, β‐keto esters, and ammonium hydroxide by using prepared STO as solid super acid heterogenous catalyst in ethanol at reflux condition. The synthesized sulfated tin oxide is confirmed by FTIR, XRD, and SEM EDX. The surface area of the catalyst is measured using BET plots. The reactions are optimized for different solvents and loading of catalyst. The yields of all 1,4‐dihydropyridine derivatives are observed in the range of 80–92%. All the synthesized DHPs are authenticated by spectral analysis. The use of environmentally benign catalyst, good atom economy, low cost and ease of work up makes this exercise efficient and sustainable.

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The synthesis of Diketopyrrolopyrrole (DPP) having secondary interaction in the side chain explores its possibility to use in electronic and sensing applications. Herein we report easy method to engineer side chains of DPP. The hydrogen bonding is introduced on the side chain by substitution of urethane side chains on Diketopyrrolopyrrole (DPPurethane).The urethane side chain comprises a branched alkyl chain with good yields and purities. The DPPurethane characterized by NMR and IR, optical properties along with energy minimized structure were studied.