List references from the University of Geneva Physical Chemistry reference database

As shown from the crystal structure, the oxygen atom of Ph₃P=CH---C(O)CH₃ forms both intra and intermolecular hydrogen bonds. X-irradiation of this compounds produces a room-temperature-stable radical which was studied by single crystal EPR/ENDOR spectroscopy. Comparison of the experimental hyperfine couplings with those obtained from ab initio calculations shows that the radical cation Ph₃P⁺---CH=C(OH)CH₂ is formed under radiolysis. The principal directions of the hyperfine tensors indicate that, in this process, some of the hydrogen bonds are broken and that the radical undergoes a drastic reorientation around the Ph₃P---C bond.

EPR/ENDOR study of an X-irradiated single crystal of 1-triphenylphosphoranylidene-2-propanone : the role of hydrogen bonds in the trapping of radiogenic radical T. Berclaz, G. Bernardinelli, M. Geoffroy, G. Rao and Z. Tancic Radiation physics and chemistry, 56 (5-6) (1999), p539-545 DOI:10.1016/S0969-806X(99)00295-9 \| unige:2736 \| Abstract \| Article HTML \| Article PDF
As shown from the crystal structure, the oxygen atom of Ph₃P=CH---C(O)CH₃ forms both intra and intermolecular hydrogen bonds. X-irradiation of this compounds produces a room-temperature-stable radical which was studied by single crystal EPR/ENDOR spectroscopy. Comparison of the experimental hyperfine couplings with those obtained from ab initio calculations shows that the radical cation Ph₃P⁺---CH=C(OH)CH₂ is formed under radiolysis. The principal directions of the hyperfine tensors indicate that, in this process, some of the hydrogen bonds are broken and that the radical undergoes a drastic reorientation around the Ph₃P---C bond.

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