Abstract
Treatment of [OsH2L4][L = P(OEt)3 or PPh(OEt)2] first with CF3SO3Me and then with an excess of terminal alkynes RCCH (R = But, Ph or p-MeC6H4) produced enynyl derivatives [Os{η3-RC3C(H)R}L4]+1–3. Sequential reactions of [OsH2L4] with CF3SO3Me and activated alkynes R′O2CCCH (R′= Me or Et) or MeO2CCCCO2Me yielded alkenyl [Os{CHC(H)CO2R′}L4]+4, 5 and [Os{C(CO2Me)C(H)CO2-Me}L4]+6 cations, respectively. Spectroscopic data (IR, 1H, 31P, 13C NMR) suggest, in the case of L = P(OEt)3, the presence of two isomers for the alkenyls 4 and 5, with five- and four-membered chelate rings of the vinyl ligand. Hydride–alkynyl [OsH(CCPh)L4] complexes were also obtained by treating [OsH2L4] with CF3SO3Me followed by treatment with lithium phenylacetylide.
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