Recent developments in the synthesis of SpellECuO nanoparticles (NPs) and their application to the [3+2] cycloaddition of azides with terminal alkynes are reviewed. With respect to the importance of click chemistry, CuO hollow NPs, CuO hollow NPs on acetylene black, water-soluble double-hydrophilic block copolymer (DHBC) nanoreactors and ZnO–CuO hybrid NPs were synthesized. Non-conventional energy sources such as microwaves and ultrasound were also applied to these click reactions, and good catalytic activity with high regioselectivity was observed. CuO hollow NPs on acetylene black can be recycled nine times without any loss of activity, and water-soluble DHBC nanoreactors have been developed for an environmentally friendly process.
Metal-organic framework (MOF)-basedd erivatives have been found to be promisingh eterogeneousc atalysts for organic transformations. Herein, hollow-structureC u-MOFs derived by reduction of Cu 3 (BTC) 2 (BTC = 1,3,5-benzenetricarboxylate;d enoted as RCB) were prepared by using hydrazine hydrate as ar educing agent under variousc onditions. The influence of hydrazine hydrate induced the structure of Cu 3 (BTC) 2 and led to dynamic variation in the interior and exterior as well as oxidation states of the Cu ion. The synthesized materials were characterized by SEM, TEM, N 2 sorptioni sotherms, XRD, and XPS. The product of the catalytic reaction was observed by GC-MS. In addition, the prepared RCBs were found to have excellent catalytic activity and selectivity for benzyl alcohol oxidation when assisted by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO).
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