In this study, the mesoporous ZnO/AlSBA-15 (Si/Al=7) nanocomposite catalyst was prepared by using a combination of direct and impregnation procedure. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope coupled with energy-dispersive x-ray spectroscopy (SEM-EDS), N2 adsorption-desorption isotherm, Fourier transform infrared spectroscopy (FT-IR), and Temperature programmed reduction (TPR-H2). The XRD and N2 sorption results show the hexagonal mesoporous nature of catalyst with type IV adsorption isotherm. The surface area was calculated by the BET method and found to be 373 m2/g. From the TPR-H2 study, the reducibility temperature of ZnO found to be 966 K. Further, the Biginelli reaction is a promising multi-component reaction in organic synthetic chemistry as it approaches the green chemistry protocols and adducts are extensively used as drugs, intermediate and in medicine. Hence, the catalytic activity was tested in one pot Biginelii reaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one's derivative. The product yield was observed to be 96% at temperature 333 K, at the short response time of 4 h. The two adducts were examined by 1HNMR, 13CNMR, and FT-IR spectroscopy. Besides, the biological activity of adduct (A) C15H18N2O5 was explored by gram-positive bacteria (Staphylococcus aureus) and gram-negative microorganisms (E. coli). The adduct (A) C15H18N2O5 shows a clear inhibition zone of 24 mm against E. Coli whereas Azithromycin shows an inhibition zone of 28 mm. Copyright © 2019 BCREC Group. All rights reserved

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For the invention of new advanced sustainable materials for heterogeneous catalysis require control of structural parameter of active sites. Mesoporous silica, especially SBA-15 has some unique and important features such as highly ordered mesopore, greater hydrothermal stability, greater wall thickness, large surface area, and adjustable pore volume. All these properties render it a promising material for catalysis, adsorption, supporting material, biomedical application, and environmental remediation. However, purely SBA-15 lacks acidic characters, which hinder its catalysis capabilities. Therefore, functionalized SBA-15 improves the catalytic activities for versatile applications. Thus, in this paper, we attempted to summarize the synthesis procedures, various functionalization processes, and application of metal modified SBA-15 in organic synthesis, fine chemical synthesis, photocatalysis, and decontamination of water. Furthermore, physicochemical properties, sustainability, and efficacies are discussed in detail for future reference and scope of studies.

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4Hydroxy-2H Chromenes are fused benzopyran rings, an important class of biologically active compounds, widely used as antibacterial, antiviral, antitumor, and anticancer agents. In this present paper, we report the 4 Hydroxy-2H Chromenes synthesis by using two catalysts namely, (i) ZnO nanoparticles and (ii) mesoporous ZnO/AlSBA-15 (7) catalysts. The ZnO NP catalyst was prepared by using leaf extract while ZnO/AlSBA-15(7) catalysts were prepared by the wet chemical route. All catalysts were characterized by XRD, SEM, EDS, FTIR, and N2 sorption techniques. The catalytic activity of the synthesized catalyst was evaluated in the one-pot reaction using aromatic aldehyde and Coumarin, and found to be maximum yield of 81% at temperature 80°C, a catalyst dose of 10 mmol %, in time limit of 4h.