SCS-pincer Pd(II) complexes have been co- valently immobilized onto porous silica, cross-linked polymer (Merrifield resin) and soluble poly(norbor- nene) supports via either amide or urea linkages and evaluated in the Heck coupling of iodobenzene with n-butyl acrylate. Kinetic experiments and poi- soning studies indicate that in all cases the pincer complexes merely act as precatalysts. Contrary to lit- erature reports, there is no evidence for catalysis by the intact amide-linked SCS-Pd(II) complexes under any conditions studied here.