Selective Hydrogenation of Diketones on Supported Transition Metal Catalysts

Characteristics and catalytic behavior of Ru–Sn bimetallic catalysts for TMCB hydrogenation to CBDO

“… 39 The metal atoms at the metal–oxide interface are usually positively charged 40 and maintain the high dispersion and stability of the metal particles by forming strong M δ + –O 2− bonds with the oxide carrier. Most carbonyl hydrogenation undergoes the enol structure, 41 but because the tetramethyl cyclobutene dione structure does not contain α-H, the hydrogenation process does not go through the enol form. Only in the presence of the carrier gamma-alumina does the hydrogenation process almost never occur, indicating that the carrier itself has no catalytic activity; that is, H 2 is not activated on the surface of the carrier but on the surface of the metal.…”