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Cyclic trimers of phosphinic acids in polar aprotic solvent: symmetry, chirality and H/D isotope effects on NMR chemical shifts

Mulloyarova, V. V. ; Giba, I. S. ; Kostin, M. A. ; Denisov, G. S. ; Shenderovich, I. G. ; Tolstoy, P. M.



Abstract

The hydrogen-bonded self-associates of dimethylphosphinic (1), diphenylphosphoric (2), phenylphosphinic (3), and bis(2,4,4-trimethylpentyl) phosphinic (4) acids have been studied by using liquid-state NMR down to 100 K in a low-freezing polar solvent, CDF3/CDClF2. The H/D isotope effects on H-1 NMR chemical shifts caused by partial deuteration of hydroxyl groups unambiguously reveal the ...

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