On-line reaction monitoring of hydrogenation reactions featuring oxygen-sensitive organometallic complexes is done via a ³¹Pbenchtop NMR spectrometer using the Multi-Resonance Sensitive Homogeneous And Resolved PEaks in Real time (MR-SHARPER) sequence. Signal enhancement generated by MR-SHARPER enables monitoring of reactivity on the order of minutes that could not be followed with traditional ³¹P{¹H} NMR detection.