ABSTRACT
The platinum complexes, [Pt4(NH3)8((CH3)3CCONH)4]-(NO3)5 and [Pt2(NH3)4((CH3)3CCONH)2](NO3)4, supported on a surface of silica gel, Al2O3, activated carbon, and poly-(4-vinylpyridine) are active heterogeneous catalysts for the liquid phase epoxidation of various olefins under 1 atm of dioxygen in the presence of isobutyraldehyde.