Vive la différence! Spatially isolated, multifunctional TiIV active sites, like those in the catalyst TAPO-5 (pictured) facilitate the conversion of cyclohexene to adipic acid with H2O2 through a cascade of six consecutive reactions, illustrating how such solids unite the advantages of heterogeneous and homogeneous catalysts. Comparisons and contrasts between these two types of catalysts are also drawn.