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

The reactivity of the frustrated Lewis pair (FLP) (F(5)C(2))(3)SnCH(2)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) (F(5)C(2))(2)SnCH(2)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 H(2) and D(2) showed it to be formed via an H(2) adduct (F(5)C(2))(3)HSnCH(2)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 H(2), [HP(tBu)(2)Me][Sn(C(2)F(5))(3)] (4), in (1)H NMR spectra, whereas 2 was not detected due to its transient nature.