Allyl alcohol, hydrogenation

PdAu Co-complex G6-Q116 allyl alcohol hydrogenation [21]... 

As Table 1 shows, several bimetallic DENs have been employed as homogeneous catalysts, predominately for hydrogenations. The most detailed studies have been with allyl alcohol hydrogenation and the partial hydrogenation of 1,3-cyclooctadiene (1,3-COD) test reactions. In these studies, turnover fre-... 

Halogens add to butenediol, giving 2,3-dilialo-1,4-butanediol (90,91) In a reaction typical of allylic alcohols, hydrogen halides cause substitution of halogen for hydroxyl (103). 

The catalytic effect of P2VP, P4VP and P2M5VP complexes with PdCl2 in the reaction of allyl alcohol hydrogenation has been studied in order to clarify the effect of polymer ligand structure on the catalyst activity [70-75]. 

In the presence of palladium catalysts, depending on reaction conditions, the substrate can either be isomerized to propionic aldehyde or be hydrogenated to propanol. Results of allyl alcohol hydrogenation on polyvinylpyridine complexes of palladium and Pd black in water at 293 K are compared in Table 13. 

Table 14. Results of allyl alcohol hydrogenation on polyvinylpyridine complexes of palladium in water at 293 K depending on the catalyst treatment...

Table 15. Influence of N Pd(ll) molar ratio on the catalytic activity of P2VP-Pd(Il) and P4VP-Pd(II) complexes in allyl alcohol hydrogenation in water at 298 K, 0.03 g catalyst sample...

The catalyst activity can change with variation of the metal concentration supported on a particular polymer. Table 15 depicts the effect of the initial molar ratio of N Pd(II) on the rate of allyl alcohol hydrogenation. 

Using Pd DENs of 1.3-1.9 nm, Crooks et al. also conducted an interesting study about the size effect on the activity for catalytic hydrogenation of allyl alcohol [97], A clear correlation was observed between the size of the DENs and their catalytic activity in allyl alcohol hydrogenation, as shown in Fig. 4.12a. Nanoparticles 1.3, 1.4, and 1.5 nm in size show similar activity for the reaction. When nanoparticles are bigger than 1.5 nm (1.7 and 1.9 nm), activity increases with increasing particle size. 

Scheme 7.7 Proposed mechanism for allyl alcohol hydrogenation in D2O in the presence of [Rh(acac)(CO)(PTA)] (32)...

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