Two new silicon/phosphorus-based frustrated Lewis pairs (FLP), F 3 SiCH 2 PtBu 2 (1) and Cl 3 SiCH 2 PtBu 2 (2) were prepared from lithiated di-tert-butylmethylphosphane, LiCH 2 PtBu 2 , and the corresponding silicon tetrahalides. They were characterised by NMR spectroscopy and by single-crystal X-ray diffraction. A gas phase electron diffraction study of 1 identified two conformers of similar energy in the vapor. The reactivity of both, 1 and 2, towards a series of small molecules was investi-
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