Magnetically Recoverable Pd/Fe3O4-Catalyzed Hiyama Cross-Coupling of Aryl Bromides with Aryl Siloxanes

Abstract

This letter describes a simple and efficient method for the synthesis of biaryls by fluoride-free Hiyama cross-coupling of bromoarenes with aryl siloxanes using magnetically separable Pd/Fe3O4 as the catalyst under aqueous conditions. This methodology is applicable to wide range of aryl bromides and aryl siloxanes. High catalytic activity, ease of recovery using an external magnetic field and use of water as the solvent are additional eco-friendly attributes of this catalytic system. The catalyst was recycled five times without significant loss of catalytic activity.