ALTADENA single-scan NMR spectroscopy of HP propane-d6 with detection at 9.4 T: (a) experimental
setup diagram,
(b) the diagram of pairwise addition of p-H2 (shown as HA – HB) to propene-d6 resulting in propane-d6, (c) T1 measurements for thermally
polarized propane-d6 by the inversion–recovery
method36 at 9.4 T, (d) ALTADENA spectrum
of HP propane-d6 with ε(app,flow)
= 100 ± 5 with respect to the spectrum (e) of stopped thermally
polarized propane-d6 gas, where unequal
thermal resonances for CHD and CD2H protons are formed
due to fast H–D exchange reaction over the metal surface of
heterogeneous catalyst, and (f) 32-scan spectrum of thermally polarized
propene-d6 gas showing residual 1H proton signals in propene-d6 groups.