PHOTOCHEMICAL REACTIVITY OF Os3(CO)12 AND THERMAL ACTIVATION OF DIOSMACYCLOBUTANES TOWARDS ALKYNES

Article abstract of DOI:10.1016/0022-328X(86)80093-6

Long wavelength photolysis of Os3(CO)12 and MeO2CCCCO2Me(DMAD) in benzene gives, as isolable products, Os2(CO)8(μ-η¹, η¹-DMAD) (4a) and Os2(CO)6(DMAD)4 (5).Structural work confirms the diosmacyclobutene arrangement in 4a and reveals a unique coupling of alkynes in 5.The potentially more general thermal reaction between preformed diosmacyclobutane and alkynes gives improved yields of 4a and allows the isolation, albeit in low yield, of Os2(CO)8(μ-η¹, η¹-CF3CCCF3) (4b).