The synthesis and characterization of a novel catalyticsystem including Pd(OAc)2 attached to a bis(oxazoline) (=BOX) ligand that is covalently bonded to 3-mercaptopropyl-functionalized silica gel is presented. The catalyst was tested for Suzuki–Miyaura reactions of different aryl halides with phenylboronic acid. The heterogeneity of the catalyticsystem was investigated using different approaches,