New Ring-opening Metathesis Polymerization Catalyst based on a Five-coordinate Tungsten(VI) Alkylidene Complex Containing an ortho-Chelating Arylamine Ligand; X-Ray Structure of (=NPh)(=CHSiMe3)(CH2SiMe3)>

Article abstract of DOI:10.1039/C39920000717

At -78 deg C reacts with 2-<(dimethylamino)methyl>phenyllithium in diethyl ether to produce a tetra-organotungsten(VI) complex which decomposes by an H_α-elimination reaction generating a novel tungsten(VI) alkylidene with intramolecular coordination of an amine function; this complex reacts with norbornene to provide a cis-polymer that is the result of an selective ring-opening metathesis.