02009nas a2200217   4500008004100000245017300041210006900214260000800283300001600291490000600307520117200313100002101485700002801506700001701534700002001551700002401571700002101595700002501616700002001641856013001661       2017                        eng d00aPredesigned metal-anchored building block for in situ generation of Pd nanoparticles in porous covalent organic framework: application in heterogeneous tandem catalysis0 aPredesigned metalanchored building block for in situ generation   cAPR  a13785-137920 v93 aThe development of nanoparticle-polymer-hybrid-based heterogeneous catalysts with high reactivity and good recyclability is highly desired for their applications in the chemical and pharmaceutical industries: Herein, we have developed a novel synthetic strategy by choosing a predesigned metal-anchored building block for in situ generation of metal (Pd) nanoparticles in the stable, porous, and crystalline covalent organic framework (COF), without using conventional reducing agents. In situ generation of Pd nanoparticles in the COF Skeleton is explicitly confirmed' from PXRD, XPS, TEM images, and N-15 NMR spectral analysis. This hybrid material is found to be an excellent reusable heterogeneous catalyst for the synthesis of biologically and pharmaceutically important 2-substituted benzofurans from 2-bromophencils and terminal alkynes via a tandem process with the turnover number up to 1101. The heterogeneity of the catalytic process is unambiguously verified by a mercury poisoning experiment and leaching test. This hybrid material shows superior catalytic performance compared to commercially available homogeneous as well as heterogeneous Pd catalysts.1 aBhadra, Mohitosh1 aSasmal, Himadri, Sekhar1 aBasu, Arghya1 aMidya, Siba, P.1 aKandambeth, Sharath1 aPachfule, Pradip1 aBalaraman, Ekambaram1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/predesigned-metal-anchored-building-block-situ-generation-pd-nanoparticles-porous-covalent