A strategy for heterogeneous copper(I) mesoporous silica [Cu (I)-SBA-15] mediated catalytic reduction has been developed for the reduction of various nitroarenes in excellent yields. In addition to alcothermal strategy, other strategies have been attempted for the preparation of Cu(I) substituted mesoporous silica, however, the desired oxidation state is obtained only through alcothermal strategy. The crystalline phases and oxidation state of synthesized materials were characterized by XRD and XPS measurements and tested for catalytic reduction of nitroarenes. Among the tested materials, the best catalytic reduction of nitroarenes with an excellent substrate scope and good catalytic reusability was established by Cu(I)-SBA-15 material. The reduction kinetics and the controlled experimental studies reveal that the reaction proceeds through pseudofirst-order kinetics and nitrosobenzene intermediate pathway.
A heterogeneous and hard bound TiIV anchored MCM‐41 material has been successfully evaluated for catalytic applications in the one pot synthesis of highly functionalized β‐amino ketones and quinoline appended π‐conjugated imines via Mannich reaction and condensation reaction, respectively. The synthetic transformation was successfully catalyzed via the dual Bronsted and Lewis acetic nature of the Ti‐MCM‐41 material that provided excellent yields of the desired products. The heterogeneous catalyst shows good catalytic performance, facile separation from the reaction mixture and can be reused in more than five catalytic cycles without any significant loss in the yield.
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