Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, XXV. Aufbau und Reaktivität von Se₁‐ und Se₂‐Brücken in Organochrom‐Komplexen

Multiple Bonds Between Main Group Elements and Transition Metals, XXV. Synthesis and Reactivity of Se₁‐ and Se₂‐Bridges in Organochromium Compounds Reaction of the ionic complex K[(η⁵‐C₅Me₅)Cr(CO)₃] (1) with selenium(I) with selenium(I) chloride, Se₂Cl₂, yields the diselenium compounds 2 of composition (η⁵‐C₅Me₅)Cr(CO)₅Se₂ which is converted to the Se₁ derivative (μ‐Se)[η⁵‐C₅Me₅)Cr₂(CO)₂]₂ (3) with triphenylphosphane. 3 exhibits a linear, multiple bonded CrSeCr core structure. Reaction of 2 with diazomethane gives the novel mononuclear, paramagnetic selenoformaldehyde complex (η⁵‐C₅Me₅)‐Cr(CO)₂(SeCH₂) (4).