Fig. 2
From: Oxidation of 1-propanol to propionic acid with hydrogen peroxide catalysed by heteropolyoxometalates

1H NMR spectra of L-proline and (ProH)3[PW12O40]
From: Oxidation of 1-propanol to propionic acid with hydrogen peroxide catalysed by heteropolyoxometalates
1H NMR spectra of L-proline and (ProH)3[PW12O40]