Figure 5.

A) Dependence of the nhPHIP hydrides signal integrals on the water content for a 200 μM solution of alanine in H₂O/CH₃OH, in the presence of Ir‐IMes catalyst (0.84 mM), pyridine (15.1 mM), 5 bar 51 %‐enriched p‐H₂ and piperidine/piperidinium (20 mM). The integrals are normalized with respect to the value measured for the lowest water content (1 %). The data were acquired at 278 K at 500 MHz ¹H resonance frequency. B) Dependence of nhPHIP on the dilution factor derived from the plot in (A). Identical symbols are used to indicate solutions with the same solvent composition.