Using 32.4 MHz 31P n.m.r. spectroscopy, disproportionation of a series of phosphinic carboxylic mixed anhydrides derived from protected α- amino acids has been studied both as a function of the substituents at phosphorus and structure of the α-amino acid being activated. It was found that the rates of disproportionation were insignificant from a preparative aspect compared with aminolysis at 0 °C.
R. Ramage, B. Atrash, D. Hopton and M. J. Parrott, J. Chem. Soc., Perkin Trans. 1, 1985, 1617 DOI: 10.1039/P19850001617
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