A new polyamine was prepared by the ring opening polymerization of epichlorohydrin and properly characterized. The catalytic property of the prepared polymer was assessed by synthesizing 2‐aryl‐substituted benzimidazole and benzoxazole derivatives by the conjugation of o‐phenylenediamine/o‐aminophenol with various aromatic aldehydes in the presence of atmospheric oxygen. Significant attributes of the present synthesis include short reaction time, good to excellent yield, high purity, easy reusability, and room temperature reaction. The reaction was carried out in the absence of any metal catalyst and other cooxidants.

A novel porphyrin-initiated amine-functionalized poly-3,3-bis(chloromethyl) oxetane (PBCMO-amine) dendritic polymer was effectively synthesized. Characterization using the UV-vis, IR, NMR, PXRD, TG, and FE-SEM spectroscopy and microscopy enabled one to assess the structural and morphological stability of the PBCMO-amine. Its catalytic activity was studied in one-pot fourcomponent solvent-free synthesis of pyrazolopyranopyrimidinone and pyranopyrazole using aldehyde, ethylacetoacetate, hydrazine hydrate, and barbituric acid/malononitrile by simple ultrasonic irradiation. Because of the water-soluble nature of PBCMO-amine, the catalyst could be separated and reused without the loss of its activity.

In recent years, deep eutectic solvents have become attractive due to their interesting characteristics such as, physicochemical properties, low cost of components, easiness to prepare, low toxicity, bio‐renewability, and biodegradability. In order to make the deep eutectic mixture more cost‐effective and renewable, carbohydrate derivatives were linked with deep eutectic mixtures, since, carbohydrates are the most important and widespread renewable compounds on the earth. In this work, we have used low melting mixtures comprised of carbohydrates to create the reaction media for organic transformations. The physical properties such as density, viscosity, acidity, refractive index, surface tension, solubility, glass transition temperature, thermal stability, solvent polarity, and toxicity of the mixture were studied. Low melting mixtures were used as reaction media and catalysts for the effective synthesis of Barbiturates. The reaction between aldehydes and barbituric acid/thiobarbituric acid, and the reaction between aldehydes, barbituric acid/thiobarbituric acid, and malononitrile/dimedone were performed effectively with good to excellent yields. The recyclability of the catalyst/solvent was also established.

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