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Inorganics 2016, 4(4), 36;

PP-Rotation, P-Inversion and Metathesis in Diphosphines Studied by DFT Calculations: Comments on Some Literature Conflicts

Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin D4, Ireland
Authors to whom correspondence should be addressed.
Academic Editor: Lee J. Higham
Received: 27 September 2016 / Revised: 27 October 2016 / Accepted: 4 November 2016 / Published: 18 November 2016
(This article belongs to the Special Issue Organophosphorus Chemistry 2016)
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The potential energy surface for internal rotation about the phosphorus–phosphorus bond was calculated at the PCMDCM/B3LYP/6-311++G(d,p) computational level for a set of eight symmetrical, unsymmetrical and P-stereogenic diphosphines; H4P2, Me4P2, (CF3)4P2, Ph4P2, Me2P–P(CF3)2, Me2P–PPh2, and the meso- and dl-isomers of Me(CF3)P–PMe(CF3) and MePhP–PMePh. Certain trends in the data were elucidated and compared with conflicting data from the literature regarding the relative population of anti and gauche rotational isomers. The pyramidal inversion barriers (stereomutation barriers in P-stereogenic cases) for the same set of diphosphines was estimated through the inversion transition states and also compared to literature values. Finally, the Me4P2 + (CF3)4P2 → 2Me2(CF3)2P2 metathesis reaction was also explored to evaluate its feasibility versus inversion. The finding of larger barriers in the metathesis than in the inversion rules in favour of an inversion mechanism for the stereomutation of P-stereogenic diphosphines. View Full-Text
Keywords: diphosphines; PP-rotation; P-inversion; metathesis; DFT calculations diphosphines; PP-rotation; P-inversion; metathesis; DFT calculations

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Molloy, A.D.; Sánchez-Sanz, G.; Gilheany, D.G. PP-Rotation, P-Inversion and Metathesis in Diphosphines Studied by DFT Calculations: Comments on Some Literature Conflicts. Inorganics 2016, 4, 36.

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