Ruthenium and Osmium Germyl Complexes Derived from the Reactions of MXCl(PPh3)3 (M = Ru, Os; X = Cl, H) with Terphenylchlorogermylene (C6H3-2,6-Trip2)GeCl (Trip=2,4,6-iPr3C6H2)

The reactions of MXCl(PPh3)(3) (M = Ru, Os; X = Cl, H) with (C6H3-2,6-Trip(2))GeCl (Trip = 2,4,6-iPr(3)C(6)H(2)) have been investigated. Teatment of MXCl(PPh3)(3) with (C6H3-2,6-Trip(2))GeCl led to the formation of dichlorogermyl chloro or hydrido ruthenium/osmium complexes (PPh3)XMGeCl2(C6H3-2-{(6)-Trip}-6-Trip) (M = Ru, X = Cl, 1; M = Os, X = Cl, 2; M = Ru, X = H, 3; M = Os, X = H, 4) through insertion of the germylene into the M-Cl bond followed by (6)-coordination of one of the Trip groups of the terphenyl to the Ru/Os center with concomitant dissociation of PPh3 ligands. Noteworthily, the reaction on OsHCl(PPh3)(3) also led to the formation of an unexpected minor product Os(H)(PPh2C6H4)GeCl(C6H3-2-{(6)-Trip}-6-Trip) (5) containing a diphenylphosphinophenyl-germyl ligand, which is presumably formed by orthometalation of the PPh3 ligand through dehydrochorination in the germylidene intermediate followed by migration of the metalated phenyl group to germanium. Reaction of 1 with PMe3 or treatment of 1 with DMSO in the presence of CuCl as the phosphine scavenger produced the PMe3- or DMSO-substituted derivatives (L)ClRuGeCl2(C6H3-2-{(6)-Trip}-6-Trip) (L = PMe3, 6; L = DMSO, 7). The reaction of 1 with LiHBEt3 afforded hydrido ruthenium complex 3, while treatment of 3 with PhCH2MgCl led to benzylation at Ge to give hydrido ruthenium-dibenzylgermyl complex (PPh3)(H)RuGe(CH2Ph)(2)(C6H3-2-{(6)-Trip}-6-Trip) (8).