Only strong Lewis acidic, arene‐solvated Me3Si+ ions react with E(SiMe3)3 compounds (E=P, As) to give the crystallographically characterized E(SiMe3)4+ onium ions 1 (left hand picture), which contain highly negative polarized P and As atoms, respectively. The masked Me3Si+ ions in 1 can be easily transferred to Et2O, to give the first structurally characterized planar silyloxonium ion [Et2(Me3Si)O]+ 2 (right hand picture).
Erst stark Lewis‐acide, arensolvatisierte Me3Si+‐Ionen reagieren mit E(SiMe3)3‐Verbindungen (E=P, As) zu den kristallographisch gesicherten E(SiMe3)4+‐Oniumionen 1 (siehe linkes Bild), die stark negativ polarisierte P‐ bzw. As‐Atome enthalten. Die maskierten Me3Si+‐Ionen in 1 können leicht auf Et2O übertragen werden, wobei das erstmals auch strukturell charakterisierte, planare Silyloxoniumion [Et2(Me3Si)O]+ 2 (rechtes Bild) entsteht.
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