Palladium(II) supported on polycarbosilane: Application as reusable catalyst for Heck reaction

• Polycarbosilane was used as the heterogeneous support in catalysis.
• Palladium(II) ion was attached to the polycarbosilane to form Pd-PCS.
• Heck reaction was considered for the catalytic activity study of Pd-PCS.
• The catalytic activity of Pd-PCS was compared with Pd(II) on usual solid supports.
• Pd-PCS catalysed the Heck reaction excellently.

Heck reaction catalyzed by palladium(II) attached polycarbosilane is reported. Polycarbosilane (PCS), which is an organic-inorganic hybrid polymer containing both Si and C in its back bone structure, was synthesized by the polycondensation of trichloromethylsilane and trimethoxyvinylsilane in the presence of sodium metal. Palladium acetate was attached to the polycarbosilane (Pd-PCS) and its catalytic activity was investigated. Heck reaction in which C–C coupling between aryl halides or vinyl halides and activated alkenes in the presence of a base has been selected for the study. Palladium ions supported on PCS have been used as a catalyst for the first time and it efficiently catalyzed Heck reaction and an yield of 75–90% was obtained with different substrates. For comparison, catalytic activities of Pd ions supported on SBA-15, activated charcoal and amorphous silica were also investigated. Results indicate the superior activity of Pd-PCS.

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