COMMUNICATIONS spectroscopy the concentrations of the reactants were chosen 15 times higher (about 0 . 3~) , which is the upper limit of solubility for the compounds I b. Id. and l e .
Fig. 1 Influence of the amount of PTSA in PTSA/Ru-binap PDMS membranes, on the hydrogenation of methyl acetoacetate at 40 °C. The ee in all cases is 90 ± 3%.
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