The large difference (4·3 p.p.m.) in the 31P n.m.r. chemical shifts of the epimers of menthyl methyl-phosphinate is explained by assuming unequal π-interactions between the bridge-oxygen atom and the phosphorus atom in the down-conformations.
F. H. Meppelder, H. P. Benschop and G. W. Kraay, J. Chem. Soc. D, 1970, 431 DOI: 10.1039/C29700000431
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