We applied this scheme to the intermediates 1 and 2. In complex 1 the dihydride spins have the same chemical shift, which should correspond to weak singlet-triplet leakage. In complex 2, however, the two hydride spins have a chemical shift difference of 2 ppm, corresponding to Δ𝜈 ≈ 1000 Hz at a field of 11.4 Tesla. This exceeds the typical size of 8Hz HH J  in these complexes by two orders of magnitude and is thus expected to give rise to significant singlet-triplet leakage.