Mehrfachbindungen zwischen Hauptgruppenelementen und Uebergangsmetallen. CI. Stereoselective Synthese gemischtalkylierter Osmiumoxide

Article abstract of DOI:10.1016/0022-328X(92)83228-A

Two-step alkylation of osmium(VI) glycolate complexes mixed-alkyl oxoosmium complexes of formula (R¹)₂(R²)₂Os=O along two different routes.Due to the chelate ligands present in the starting compounds, square-pyramidal alkyl complexes of cis-geometry (R¹/R¹ and R²/R² respectively) are obtained in stereoselective reactions.The crystal and molecular structure of dimethyl(2,3-dimethylbutane-2,3-diolato)oxoosmium(VI) (4a) has been determined by X-ray diffraction, again revealing a square-pyramidal core geometry with the oxo ligand at the apex position .