Abstract
A silica-supported poly-γ-diphenylarsinopropylsiloxane palladium(0) complex has been prepared from γ-chloropropyltriethoxysilane via immobilization on fumed silica, followed by reacting with potassium diphenylarsenide in THF and palladium chloride in acetone, and then the reduction with hydrazine hydrate in ethanol. The complex is a highly active and stereoselective catalyst for arylation of conjugated alkenes with aryl halides affording a variety of unsymmetrical trans-stilbenes and substituted trans-cinnamic acids in high yields. This polymeric palladium catalyst can be recovered and reused.
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