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.