Austausch‐Reaktionen von Phosphor(v)‐Verbindungen und ihre pentakoordinierten Zwischenstufen

Die Reaktionen von Phosphor(v)-Verbindungen, in deren Verlauf Ubergange zwischen tetra- und pentakoordinierten Spezies stattfinden, werden in einer kritischen Ubersicht unter besonderer Berucksichtigung der stereochemischen Aspekte des Reaktionsmechanismus diskutiert. Die Diskussion schliest die Bildung und den Zerfall der stabilen Oxyphosphorane, die Michaelis-Arbusov-, Perkov- und Wittig-Reaktionen, die wechselseitigen Umwandlungen von Phosphanen und deren Oxiden sowie nucleophile Substitutionen an Phosphonium-Ionen mit ein. Umsetzungen von Phosphorsaureestern und verwandten Verbindungen werden in den Vordergrund gestellt. Die gesamte chemische Argumentation entstammt der Betrachtung derjenigen Faktoren, welche die Stabilitat von Phosphoran-Derivaten sowie die Geschwindigkeiten ihrer Bildung, ihres Zerfalls und ihrer Umordnungsprozesse durch Deformation, Knupfen und Losen von Bindungen bestimmen. Die einheitliche Behandlung dieses weiten Gebietes wird durch Vorstellungen ermoglicht,die erst zum Teil in einer vorangehenden Publikation[2] eingefuhrt wurden. Es wird aufgezeigt. Das eine umfassende mechanistische Interpretation eine Weiterentwicklung der bisherigen Konzeptionen erfordert, und das einige der fruheren Vorstellungen revisionsbedurftig sind.

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