The endo-bidentate chelated structure of the title compound corresponds to protonation on the dimethylamino group; the oxygen atom of triphenylphosphine oxide acts as a double acceptor of hydrogen bonds.
A. L. Llamas-Saiz, C. Foces-Foces, J. Elguero, P. Molina, M. Alajarín and A. Vidal, J. Chem. Soc., Chem. Commun., 1991, 1694 DOI: 10.1039/C39910001694
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