R. Boetzel et al., P-31 NMR SPECTROSCOPIC INVESTIGATION OF EXCHANGE PROCESSES IN 2 BIFUNCTIONAL AMINOPHOSPHONATES, Magnetic resonance in chemistry, 33(4), 1995, pp. 244-248
Variable-temperature P-31 NMR spectroscopy was used to extract Arrheni
us and Eyring parameters of the hindered rotation about amide bonds in
an acylated aminophosphonate, The results permit the differentiation
between stepwise or concerted rotation.