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- W2035857963 abstract "Monohydride complexes MHXP4 [M = Ru or Os; X = Cl−, Br−, I−, SEt− or N3−; P = P(OEt)3, PPh(OEt)2 or PPh2OEt] were prepared by treating dihydride species MH2P4 first with CF3SO3Me and then with an excess of the anionic ligand X. In an argon atmosphere, protonation of MHXP4 with HBF4·Et2O gives dihydrogen cations [MX(η2-H2)P4]+, with X = Cl, Br, I or SEt; the classical dihydride [MH2(N3)P4]+ was obtained with the azide ligand. Instead, in a hydrogen atmosphere, protonation of MHXP4 with HBF4·Et2O gives hydride–dihydrogen [MH(η2-H2)P4]+ species, according to a proposed mechanism involving interaction of Brønsted acid with ligand X. Some [MX(η2-H2)P4]+ cations were thermally unstable and fully characterised in solution (1H and 31P NMR, variable temperature T1 measurements), whereas the [OsX(η2-H2){PPh(OEt)2}4]BF4 complexes were stable and isolated as solids. Treatment of [MX(η2-H2)P4]+ cations with alkyne PhCCH gave evolution of H2 and formation of the vinylidene intermediate [MX{CC(H)Ph}P4]+ which, by reaction with base, afforded the final acetylide M(CCPh)XP4 derivatives. Treatment with propargyl alcohols HCCC(OH)RR′ of the [MX(η2-H2)P4]+ cations, instead, gave propadienylidene derivatives [MX(CCCRR′)P4]BPh4 (M = Ru or Os; R = R′ = Ph or R = Ph, R′ = Me). Hydrazine complexes [MX(NH2NH2)P4]BPh4 were also prepared by substitution of the dihydrogen ligand in the new η2-H2 derivatives." @default.
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- W2035857963 date "2000-01-01" @default.
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- W2035857963 title "Preparation and reactivity of dihydrogen complexes [MX(η2-H2)P4]BF4 (M = Ru or Os; X = halogenide or SEt−; P = phosphite)" @default.
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