Patent ID: 8680306

Claim:
An organometallic compound based on a group 6 metal, of imido alkylidene type, comprising at least one boron-based ligand, bonded to the metal via a covalent bond with sulfur, oxygen or nitrogen, which is one of the following formulas I, II, III or IV: wherein: M represents molybdenum or tungsten, X 1 , X 2 , X 3 , and X 4 , different or identical, each represents an oxygen atom, a sulfur atom or a NH group, optionally substituted by a hydrocarbyl radical having 1 to 30 carbon atoms, R 1 , R 2 , R 3 and R 4 , identical or different, each represents hydrogen, a halogenide or an organic radical having 1 to 30 carbon atoms, and R 6 and R 7 , identical or different, each represents an organic radical having 1 to 30 carbon atoms.