Profile of MRNi in Hydrogenation

In the case of substrates which are corrosive to Ni, when the hydrogenation was carried out under high pressure, TA-MRNi exhibited the highest reaction rate, whereas RNi and Glu-MRNi exhibited the same rate as shown in Fig. 4 (30). Hydrogenations of these substrates under atmospheric pressure did not proceed in liquid phase over unmodified RNi because of the corrosion of the catalyst by the substrate. 

Since the hydrogenation of MAA with unmodified RNi did not proceed as mentioned in the previous section, the kinetic parameters of the liquid-phase reaction with MRNi under atmospheric pressure could not be compared with those of RNi. However, it can be expected that the modification does not change the nature of hydrogenation with RNi since the activation energies of MRNis were exactly the same as each other and independent of the sort of modifying reagent. This expectation was confirmed by the results 

Hydrogenation Activity of RNi Modified with Glutamic Acid (Glu-MRNI)  

Reaction conditions Gas phase (100-300 Torr) Liquid phase (atm. pressure) 

Correlation between the Rate, Optical Yield, and Absorbed Amount of Modifying Reagent on the Catalyst  

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