Suzuki coupling reaction for synthesis of boscalid intermediate over Pd/C catalyst
Activated carbon ( AC) was modified with hydrogen peroxide and used as supports for preparation of Pd/C catalysts. The characterization results revealed that the AC textural structure and surface properties were selectively modified via different temperature treatments,and the surface functional groups of the supports could affect the dispersion and chemical states of Pd nanoparticles. Compared with other treatment temperatures, the surface of AC treated at 250 ℃ contained more acidic oxygen-containing groups,and the as-prepared Pd/C showed the highest dispersion. In Suzuki coupling reaction for the synthesis of 4' -chloro-2-nitrobiphenyl,an intermediate of boscalid,the activity of the Pd/C was significantly improved, and the reaction yield was increased. The acidic oxygen-containing group provided an effective anchor sites for the dispersion of palladium nanoparticles on the surface of AC, promoted the electron transfer between the support and palladium nanoparticles,and formed relatively electron-deficient Pd nanoparticles,thus improving the activity of Pd/C catalyst.
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