2-Propen-1-ol hydrogenation and isomerisation on polymer-palladium complexes — effect of polymer matrix

Highly selective asymmetry transfer hydrogenation of prochiral acetophenone catalyzed by palladium?chitosan on silica

“…Pd 0 is. produced by the reduction of some Pd 2+ ions by ethanol during the preparation process [13,14].…”

Catalytic isomerization of allylic alcohols promoted by complexes [RuCl2(η6-arene)(PTA-Me)] under homogeneous conditions and supported on Montmorillonite K-10

“…The resulting systems were able to isomerize selectively 1-octen-3-ol into octan-3-one and could be recycled (up to four times), but their activities were relatively low (TOF up to 12 h −1 ). PdCl 2 impregnated on different polymers was also employed to promote redox isomerization processes [13]. However, the requirement of a hydrogen atmosphere resulted in low selectivities toward the desired carbonyl compounds, due to the occurrence of hydrogenation and hydrogenolysis reactions in competition [14].…”

Hydrogen (H2) sensing and catalysis with organic-stabilized Pd and Pd alloy nanoparticles.

“…152 In the case of the homogeneous 12x C16NH 2 Pd and PdAg NP catalysts, the selectivity to the alcohol was 60% which is lower than that of the commercial hydrogenation catalysts with high surface area, such as Pd/C 130,139 and Pd/Al 2 O 3 (~75%). 136,152 However, these NP catalysts exhibited higher activity (TOF = 700-1000), with C16NH 2 Pd 91 Ag 9 NPs being the best, compared to the activity of other homogeneous systems previously investigated including Pd and Pt NPs stabilized by dendrimers 30,123 and alkanethiolate monolayers (TOF < 500). 38,[130][131][132][133] Other studies have reported TOF >> 1000 when hollow polystyrene nanospheres 135 and collagen fiber 136 coated with Pd NPs were used to catalyze the hydrogenation of allyl alcohol.…”

“…151 Zharmagambetova and co-workers studied the route of the catalytic reaction of allyl alcohol with hydrogen on polymerPd(0) and Pd(II) complexes. 152 They determined that catalytic activity and selectivity depends on the Pd valence state, structure of the polymer matrix, and functional groups.…”

“…[143][144][145][146][147] Although heterogeneous Pd catalysts, such as Pd/TiO 2 , 151,179 polymer-Pd(0) and Pd(II) complexes, 152 and Pd NPs stabilized by polymers and immobilized on composites or embedded in polyelectrolyte films, 134,[180][181][182] have been used to study the activity and selectivity for hydrogenation and isomerization of allyl alcohols, the favored hydrogenation process prohibited formation of the isomer. An important challenge is to controllably obtain the alcohol, or the saturated carbonyl that the substrate also plays a role in NP stability.…”