Synthesis and Protonation Studies of Cp*Os(dppe)H: Kinetic versus Thermodynamic Control

Pavel Dub (1) , Natalia V Belkova (1) , Konstantin A Lyssenko (1) , Gleb A Silantyev (1) , Lina M Epstein (1) , Elena S Shubina (1) , Jean-Claude Daran (2) , Rinaldo Poli (2)

1 INEOS - A. N. Nesmeyanov Institute of Organoelement Compounds
2 LCC - Laboratoire de chimie de coordination

The previously undescribed complex Cp*Os(dppe)H was synthesized starting from either K2OsX6 salts or H2OsBr6 and characterized together with its precursors Cp*Os(COD)X (X = Cl, Br). Protonation of 1 by HBF4·Et2O was studied in CD2Cl2 at 193 K and was found to lead exclusively to cis-[Cp*Os(dppe)(H)2]+BF4−, which irreversibly transforms into trans-[Cp*Os(dppe)(H)2]+BF4− above 230 K.

Mots clés: Potassium; Anions; Reaction mechanisms; Metals; Molecular structure; Osmium; Hexahaloosmate(IV); Pentamethylcyclopentadienyl ligand; Hydrido complexes; Protonation

Domaines: Chimie de coordination

Pavel Dub, Natalia V Belkova, Konstantin A Lyssenko, Gleb A Silantyev, Lina M Epstein, et al.. Synthesis and Protonation Studies of Cp*Os(dppe)H: Kinetic versus Thermodynamic Control. Organometallics, 2008, 27 (13), pp.3307-3311. ⟨10.1021/om8000235⟩. ⟨hal-03192527⟩