Role change: The arsenium salt As[P(NMe2)3]2+BPh4− (1), prepared for the first time, proved to be both an arsenic(I) and a phosphorus(I) source. Thus the reaction of 1 with [Cp2Zr(H)Cl] (Cp=η5‐C5H5) leads not only to the first arsonium ion with anti‐van't Hoff–Le Bel configuration 2 a (E=As; see structure), but at the same time to the homologous phosphonium ion 2 b (E=P).
Rollentausch: Das erstmals hergestellte Arseniumsalz As[P(NMe2)3]2+BPh4− 1 erwies sich als Arsen(I)‐ und als Phosphor(I)‐Quelle. So führt die Umsetzung von 1 mit [Cp2Zr(H)Cl] (Cp=η5‐C5H5) nicht nur zum ersten Arsoniumion mit Anti‐van't‐Hoff/Le‐Bel‐Konfiguration 2 a (E=As; siehe Struktur im Kristall), sondern gleichzeitig auch zum homologen Phosphoniumion 2 b (E=P).
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