Reactions of dodecacarbonyl-triangulo-triosmium with alkenes and benzene; fluxional behaviour of µ3-(ethan-1-yl-2-ylidyne)-di-µ-hydrido-triangulo-tris(tricarbonylosmium)(3Os–Os)
Abstract
Ethylene on reaction with Os3(CO)12 heated under reflux in octane undergoes 1,1-elimination of H2 to give the ethan-1-yl-2-ylidyne complex [H2Os3(CH2C)(CO)9], (I), whereas cyclopentene and benzene undergo 1,2-elimination of H2 to give corresponding cyclopenta-1,2-diylidene and cyclohexa-3,5-dien-1,2-diylidene complexes (II) and (III). Kinetic data are given for intramolecular exchange of the –CH2C![[triple bond splayed right]](https://www.rsc.org/images/entities/char_e00c.gif)
hydrogen atoms of complex (I) which is faster than hydride exchange, and mechanisms for these processes are discussed. Diphenyl(o-vinyl-phenyl) phosphine (dpvp) reacts with Os3(CO)12 to give the complex [H2Os3(Ph2P·C6H4·C2H)(CO)8], (IV), which is related to the derivatives above.
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