Syntheses and catalytic application of hydrido iron(ii) complexes with [P,S]-chelating ligands in hydrosilylation of aldehydes and ketones

Abstract

Four hydrido iron(II) complexes (1–4) with [P,S]-chelating ligands were synthesized by the reactions of (2-diphenylphosphanyl)thiophenols, C₆H₃(1-SH) (2-PPh₂) (4-R₁) (6-R₂), abbreviated as (P^SH), with Fe(PMe₃)₄. (1: R₁ = R₂ = H; 2: R₁ = H, R₂ = SiMe₃; 3: R₁ = CH₃, R₂ = H; 4: R₁ = SiMe₃, R₂ = H). Among them, complexes 2–4 are new and were completely characterized by spectroscopic methods. The molecular structures of complexes 2, 3, and 4 were confirmed by X-ray single crystal diffraction. The catalytic properties of hydrido iron(II) complexes 1–4 were explored in the hydrosilylation of aldehydes and ketones. They showed a good activity in catalytic hydrosilylation of aldehydes and ketones by using (EtO)₃SiH as a hydrogen source under mild conditions.