UEBERGANGSMETALL-CARBIN-KOMPLEXE. LXXXIII. NEUE ANIONISCHE mer-DIHALOGENO-TRICARBONYL-DIALKYLAMINO-CARBIN-KOMPLEXE DES WOLFRAMS

Article abstract of DOI:10.1016/0022-328X(86)80198-X

The reaction of trans-X(CO)4WCNR2 (X = Br, R = ^chex (cyclohexyl); X = Cl, R = ^chex, ⁱpr (isopropyl)) with M⁺X^- (M⁺ = NEt4⁺, X^- = Br^-; M⁺ = PPN⁺, X^- = Cl^-) leads under substitution of one CO ligand to new anionic dihalo(tricarbonyl)carbyne-tungsten complexes of the type M⁺ mer-<(X)2(CO)3WCNR2>^- (M⁺ = NEt4⁺, X = Br, R = ^chex; M⁺ = PPN⁺, X = Cl, R = ^chex, ⁱpr), whose composition and structure were determined by elemental analysis as well as by IR, 1H and 13C NMR spectroscopy.In the anionic carbyne complexes the entered halogen ligand, coordinated in a cis position relative to the carbyne ligand on the metal, can be easily substituted by neutral nucleophiles, as the reaction of PPN⁺ mer-<(Cl)2(CO)3WCN^chex2>^- with PPh3 demonstrates yielding the neutral carbyne complex mer-chex2>.