An α-diazoalkylosmium complex as carbyne-complex precursor. Synthesis and X-ray crystal structure of [OsCl(I)(NO)(PPh2C6H4CHCO2Et)(PPh3)], the product of an intramolecular carbyne insertion reaction

Abstract

The α-diazoalkylosmium complex [OsCl(I)(NO)(CN₂CO₂Et)(PPh₃)₂] loses N₂ to give the title complex and the formation of this metallacyclic compound, which has been structurally cahracterised by single crystal X-ray diffraction, is interpreted as arising from an intramolecular insertion reaction of an intermediate cationic carbyne complex, [OsCl(NO)(C–CO₂Et)(PPh₃)₂]I.