Fig. 2. NMR spectra of a) 1H hydride region and b) 13C carbonyl region after shaking a solution of 1a, 6 equivalents sodium pyruvate-1,2-[13C2] and 4 equivalents of DMSO with 3 bar p-H2 for 10 seconds a) at 65 G or b) in a mu metal shield c) the averaged 13C signal gain across the [1-13C] and [2-13C] sites and hyperpolarised hydride signal intensity of 3b can be monitored over time with fresh p-H2 shaking. Note that one anomalous data point was omitted.
