Homoleptic chelating N-heterocyclic carbene complexes of palladium immobilized within the pores of SBA-15/IL (NHC–Pd@SBA-15/IL) as heterogeneous catalyst for Hiyama reaction

• SBA-15/IL were applied as a support for Pd in Hiyama reaction of various aryl halides and triethoxyphenylsilane.
• NHC–Pd/SBA-15/IL was synthesized.
• A reusable porous catalyst system using commercially available material was employed.
• Represents advantages, operational simplicity, no waste, higher yield and with easy workup.

In this work, SBA-15 was selected as a support for the homoleptic chelating N-heterocyclic carbene complexes of palladium. Here, Pd2+ ions were coordinated to N-heterocyclic carbene (NHC–Pd) which also contain ionic liquid. Then, this NHC–Pd@SBA-15/IL catalyst (NHC–Pd active part of the catalyst) was successfully applied in the catalysis of Hiyama coupling reaction with lower mol% Pd rather to previously reported literatures. The role of TBAF and Cs2CO3 in the decrease of Pd mol% was crucial. Recyclability test showed a successful reusability for 5 runs. Simultaneous application of TBAF and NaOH did destroy the silica structure of SBA-15 in the first run.

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