A new family of phosphine-free Amino-chroman-4-one ((Z)-2ethoxy-3-((phenylamino)methylene)chroman-4-one) bidentate ligands ware successfully synthesised and characterised. The bidentate ligand act as efficient catalyst with combination of Pd (II) salt in the CÀ C bond formation and exhibited excellent performance in the Suzuki-Miyaura and Mizoroki-Heck coupling reaction. A broad range of substrates, including heterocyclic, flavones, Isatin and sterically hindered coupling partner, were well tolerated under the optimized reaction conditions. Metal complex and all the intermediates were formed in the catalytic cycle were characterized by mass spectrometry to support the reaction mechanism.

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A highly efficient KOtBu‐mediated aza‐Michael addition of aromatic amines and/or N‐phenylurea derivatives to 3‐nitro‐2‐phenyl‐2H‐chromenes and sequential aerobic dehydrogenation is reported. This method provides a novel protocol for C–N bond formation in 3‐nitro‐2‐phenyl‐2H‐chromenes under cost‐effective and operationally convenient conditions. A wide range of 4‐(phenylamino)‐3‐nitro‐2‐phenyl‐2H‐chromenes have been synthesized in good‐to‐high yields (68–86 %) at 35–40 °C within 5–10 minutes.

In recent times, mesoporous silica sieves gathered considerable attention from a fundamental as well as an applied perspective. Particularly, MCM‐41 has become increasingly popular among researchers because of its chemical flexibility and application in various fields. In addition, MCM‐41‐based materials are currently being extensively studied for their utility as substrates, adsorbents, catalysts, molecular hosts, and ion exchangers. This review article provides a thoughtful analysis of the developments in these areas, particularly emphasizing the recent advance in the functionalization of MCM‐41 via metal complex and their catalytic applications in a variety of reactions such as coupling reactions and oxidation reactions. This review explores the catalytic properties that led to such widespread use, and why there is now an increasing drive to synthesize such a catalytic system.

An operationally efficient and regioselective hydrodehalogenation methodology of aromatic α‐ and β‐halo carbonyl compounds has been developed using CuI in isopropanol at 90 °C under basic condition. The catalytic system effectively dehalogenates chloride, bromide, and iodide groups and afforded high yield (up to 97 %) as carbonyl compounds. The methodology is environmentally friendly and demonstrates excellent tolerance to a broad range of electronically rich and poor substituents.