4-Phenol diazoniumsalts undergo Pd-catalyzed Heck reactions with various styrenes to 4′-hydroxy stilbenes. In almost all cases higher yields and fewer side products were observed, compared to the analogous 4-methoxy benzene diazoniumsalts. In contrast, the reaction fails completely with 2- and 3-phenol diazoniumsalts. For these substitution patterns the methoxy-substituted derivatives are superior