科研之友
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摘要
A porous organic polymer (POP POPh3) was readily prepared by oxidation of POP-PPh3 with H2O2. After coordination with PdCl2 and a co-catalyst of a CuBr2 precursor, a Pd/Cu bimetal-loaded porous organic polymer (Pd/Cu@POP-POPh3) was afforded. The NMR and XPS characterizations indicated that both Pd(II) and Cu(II) could coordinate with the P=0 bonds in the polymer. Furthermore, the catalyst has high surface areas, hierarchical porosity and good thermostabitity. The Pd/Cu@POP-POPh3 catalyst was successfully used in heterogeneous oxidation of atkynes with O-2 as the oxidant to afford corresponding 1,2-diketones in high to excellent yields (76-99%). A series of atkynes with various functional groups performed welt in the process. Remarkably, the heterogeneous catalyst can be reused for five cycles without significant toss of catalytic activity in oxidation of diphenytacetylene.
