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A series of Pd catalyst supported on tungstated metal oxides (Pd/W–MOx) were prepared and applied for pyrene hydrogenation, and the role of acid sites of supports was investigated. Among Pd/W–MOx catalysts, Pd/W–TiO 2 showed the highest activity which was comparable to those of Pd/BEA, Pd/Y and Pd/SiO 2 –Al 2 O 3 . As for the Pd catalysts supported on metal oxides without...
The synthesis of bisbenzopyran-4-ol (1) was performed through the key steps of iodination, nickel(0)-modified Ullmann-type reaction, hydrogen-transfer hydrogenation and diastereoselective reduction. The X-ray diffraction experiment of compound 9 confirmed that the reported structure in the literature was not the real natural product.
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