Acidic ionic liquid, [(Py) 2 SO][HSO 4 ] 2 has been used as an efficient catalyst for the reaction of ketone with thiosemicarbazide in ethanol at room temperature for the eco-friendly synthesis of spiro-1,2,4-triazolidine-3-thiones. Smooth reactions, ambient temperature, use of alcohol as a solvent, high yields, easy workup procedure and excellent recyclability of ionic liquid and high atom economy are the auxiliary advantages of the present protocol, which makes it ecofriendly. All the synthesized 1,2,4-trioazoles were screened for antimicrobial activity. Most of compounds displayed moderate to good biological activity.

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A new task specific ionic liquid with hydroxyl and prolinate functionalities acts as a reducing agent and serves as a ligand and stabilizer for in situ formed palladium nanoparticles. This system displays high catalytic activity for Suzuki–Miyaura cross-coupling in water.

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A novel and robust dication Brønsted acidic ionic liquid as a catalyst for the temperature influenced synthesis of novel pyranopyrimidinediones and pyranopyrimidinetriones.

An efficient basic ionic liquid 1‐[3‐(dimethylamino)propyl]‐2,3,4,6,7,8,9,10‐octahydro‐1H‐pyrimido[1,2‐a]azepin‐5‐ium chloride, [DPPA] Cl− is designed for the convenient synthesis of diversely functionalized 3‐ acetoacetyl −6‐ aryldiazenyl‐ coumarins from 5‐aryldiazenyl salicylaldehydes and 4‐hydroxy‐6‐methyl‐2‐pyrone in ethanol‐water mixed solvent system. The synergic effect of DBU nucleus and tethered basic dimethylaminopropyl chain facilitates efficient catalysis of the reaction. Novelty of method is synthesis of highly conjugated molecular scaffold with the assistance of hybrid reusable basic ionic liquid, atom economy, wide substrate scope, short reaction time, high yields and use of eco‐benign ethanol‐water mixed solvent system, etc. The synthesized compounds exhibit fluorescence properties that could unlock the window for their use as a fluorescent material.