Übergangsmetall-Carben-Komplexe, CXXXIV [1]. Synthese neuer Mono- und Biscarben-Komplexe der VI. Nebengruppe; Röntgenstruktur des ersten Bis[amino(alkoxy)carben]-Komplexes / Transition Metal Carbene Complexes, CXXXIV [1]. Synthesis of New Mono- and Bis-Carbene Complexes of Group VIb Elements; Structure of the First Bis[amino(alkoxy)carbene]-Complex

Abstract

<jats:p>The hexacarbonyl compounds of chromium, molybdenum and tungsten react with the highly nucleophilic agent Li N<jats:sup>i</jats:sup>Pr<jats:sub>2</jats:sub> and in a subsequent alkylation with (Et<jats:sub>3</jats:sub>O)BF<jats:sub>4</jats:sub> to give the carbene complexes (CO)<jats:sub>5</jats:sub>M[C(N′Pr<jats:sub>2</jats:sub>)OEt] (1, 3, 4). In case of W(CO)<jats:sub>6</jats:sub> and Mo(CO)<jats:sub>6</jats:sub> the novel biscarbene complexes cis(CO)<jats:sub>4</jats:sub>M[C(N<jats:sup>i</jats:sup>Pr<jats:sub>2</jats:sub>)OEt]<jats:sub>2</jats:sub> (2, 5) are additionally obtained. Reaction conditions, properties and spectroscopic data of the new compounds are reported. The molecular structure of cis(CO)<jats:sub>4</jats:sub>W[C(N<jats:sup>i</jats:sup>Pr<jats:sub>2</jats:sub>)OEt]<jats:sub>2</jats:sub> (4) was determined by X-ray crystallography</jats:p>