“…62 Very recently, Maeda, Baiker and co-workers proposed a possible intermediate and complex between a substrate and a modifier formed by multiple hydrogen bonds. 64 Based on this chiral NP system, other types of chiral NP catalysts for asymmetric hydrogenation reactions, for example nickel-boride NPs, 68 Pd NPs, [69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85] Ru NPs, [86][87][88][89][90] Rh NPs, 88,[91][92][93][94][95][96] Ir NPs, 88,[97][98][99] and Fe NPs, 100 have been widely investigated. Several reviews illustrate examples of heterogeneous asymmetric hydrogenation reactions.…”