| Abstract
| - CF3SiMe3 (Ruppert's reagent) has been investigated by gas phase electron diffraction, microwave spectroscopyand quantum chemical methods, deriving structural parameters and the barrier height for the methyl torsion.The bond length of the Si−CF3 bond, 1.941(3) Å, is the longest Si−C bond observed so far in the gas phase.The V3 barrier for the methyl group torsion (V3 = 5.71 kJ/mol) is only slightly lower than barriers determinedfor other trimethylsilane compounds.
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