Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, CXX. Niob‐ und Tantalamid–Komplexe sowie neue Cyclocarbodisilazane

Abstract

Multiple Bonds Between Main–Group Elements and Transition Metals, CXX[1]. – Niobium and Tantalum Amide Complexes and New CyclocarbodisilazanesThe new niobium‐ and tantalum complexes 3a and 3b of formula [(CH3)2 are accesible by the reaction of the oxychlorides MOCl3 with the lithium amide (2) in 30 and 19% isolated yield, resp. The new silazanes cyclo‐[(CH3)2Si(CH2)2Si(CH3)2NH]2 (5) and cyclo‐[(CH3)2Si(CH2)2Si‐(CH3)2NH]3 (6) are prepared from (CH3)2ClSiCH2CH2Si–Cl(CH3)2 and NH3. Their structures – ten‐ and fifteen–membered rings – were determined by single–crystal structure analyses.