Dihydrogen and Hydrido Complexes via Hydrogen Addition to d6 Five-co-ordinate Complexes of Ruthenium and Osmium with 1,2-Bis(dicyclohexylphosphino)ethane

The dihydrogen complexes [MX(eta-2-H-2)(dcpe)2]BPh4 [dcpe = 1,2-bis(dicyclohexylphosphino)ethane; M = Ru, X = H or Cl; M = Os, X = Cl] were prepared by reaction of molecular hydrogen with the five-co-ordinate complexes [MX(dcpe)2]BPh4, or by protonation of the hydrides [MH(X)(dcpe)2]. The same synthetic procedures yielded [OsH3(dcpe)2]BPh4, for which a classical trihydride seven-co-ordinate structure is proposed. The compounds have been characterized by variable-temperature H-1 and P-31-{H-1} NMR spectra and T1 measurements. The reaction of molecular hydrogen with the complexes cis-[MCl2(dcpe)2] to yield trans-[MH(Cl)(dcpe)2] and cis-[MH2(dcpe)2] is also discussed

Effect of Bulky Ligands on the Hydrogenation of Olefins Catalyzed by cis-[MH2(dcpe)2] (M = Ru, Os; dcpe = 1,2-Bis(dicyclohexylphosphino)ethane)

cis-[RuH2(dcpe)2] and cis-[OsH2(dcpe)2] (dcpe = Cy2PCH2CH2PCy2) behave as catalyst precursors for the hydrogenation of C = C bonds in a number of organic substrates. The ruthenium species is the more active one for the reduction of enones to saturated ketones. In contrast, the hydrogenation of unactivated olefins is faster in the presence of the osmium catalyst. Experimental evidence of the formation of the catalytically active species via dissociation of one diphosphine is obtained

Effect of Bulky Ligands on the Hydrogenation of Olefins Catalyzed by cis-[MH2(dcpe)2] (M=Ru,Os; dcpe=1,2-Bis(dicyclohexylphosphino)ethane

Hydrogenation of olefins catalyzed by ruthenium and osmium complexe

Chemoselective Hydrogen Transfer Reduction of alpha,beta-Unsaturated Ketones Catalyzed by Isostructural Iron(II), Ruthenium(II) and Osmium(II) cis-Hydride(\uf0682-dihydrogen) Complexes

Hydrogen transfer reduction catalyzed by iron, ruthenium and osmiu

Chemoselective Reduction of Enones to Allylic Alcohols

Hydrogen transfer reactions with heterogeneous catalyst

Disproportionation of Acyclic Ketones to Carboxylate Ions and Ethers: a Poisoning Reaction on the Way to the Chemoselective Reduction of a,b-Unsaturated Ketones to Allylic Alcohols via Hydrogen Transfer Catalyzed by a Non-classical Ruthenium(II) Trihydride

Ruthenium promoted disproportionatio

L'impero nel cassetto. Memorie dell'Italia coloniale tra album privati e archivi pubblici

un'analisi del problema della memoria coloniale e la presentazione del progetto Returning and Sharing Memorie

Electron-Rich Iridium Complexes with Mixed-Donor Polydentate Ligands. Chemoselective Catalysts in Hydrogen Transfer Reduction of alpha,beta-Unsaturated Ketones

Iridium catalysts for HT