The n.m.r. sense of nonequivalence of (–)α-phenylethylamine salts of chiral phosphorus thio-acids has been correlated with their absolute configurations; the (R)-configuration is assigned to (–)-O-methylmethylphosphonothioic acid and (–)-O-ethylmethylphosphonothioic acid.
M. Mikołajczyk, M. Para, A. Ejchart and J. Jurczak, J. Chem. Soc. D, 1970, 654 DOI: 10.1039/C29700000654
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