Barium siloxides and catalysed formation of Si-O-Si' motifs

Erwann Le Coz (1) , Samia Kahlal (1) , Jean-Yves Saillard (1) , Thierry Roisnel (1) , Vincent Dorcet (1) , Jean-François Carpentier (1) , Yann Sarazin (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

The first unsupported barium siloxide, the homoleptic dimer [Ba {μ -OSi(SiMe ) } {OSi(SiMe ) }], is presented, and its structural features are discussed in the light of DFT computations. This complex, together with the related [Ba{μ -OSi(SiMe ) }{N(SiMe ) }] and their parent [Ba{N(SiMe ) } ] , mediates the formation of asymmetric siloxanes R Si-O-SiR' through the first case of main group metal-mediated dehydrocoupling of silanols and hydrosilanes. Early kinetic analysis highlights an unusual catalytic manifold.

Mots clés: low-coordinate complex; asymmetric siloxanes; siloxide; barium; dehydrocoupling catalysis

Domaines: Chimie de coordination; Catalyse

Erwann Le Coz, Samia Kahlal, Jean-Yves Saillard, Thierry Roisnel, Vincent Dorcet, et al.. Barium siloxides and catalysed formation of Si-O-Si' motifs. Chemistry - A European Journal, 2019, 25 (59), pp.13509-13513. ⟨10.1002/chem.201903676⟩. ⟨hal-02280837⟩