A Zwitterionic Phosphonium Stannate(II) via Hydrogen Splitting by a Sn/P Frustrated Lewis-Pair and Reductive Elimination.

ABSTRACT: The reactivity of the frustrated Lewis pair (FLP) (F₅ C₂ )₃ SnCH₂ P(tBu)₂ (1) was investigated with respect to the activation of elemental hydrogen. The reaction of 1 at elevated hydrogen pressure afforded the intramolecular phosphonium stannate(II) (F₅ C₂ )₂ SnCH₂ PH(tBu)₂ (3). It was characterized by means of multinuclear NMR spectroscopy and single crystal X-ray diffraction. NMR experiments with the two isotopologues H₂ and D₂ showed it to be formed via an H₂ adduct (F₅ C₂ )₃ HSnCH₂ PH(tBu)₂ (2) and the subsequent formal reductive elimination of pentafluoroethane; this is supported by DFT calculations. Parahydrogen-induced polarization experiments revealed the formation of a second product of the reaction of 1 with H₂ , [HP(tBu)₂ Me][Sn(C₂ F₅ )₃ ] (4), in ¹ H?NMR spectra, whereas 2 was not detected due to its transient nature.

SUBMITTER: Holtkamp P 

PROVIDER: S-EPMC7839681 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature