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

摘要

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-R-1) (6-R-2), abbreviated as (P boolean AND SH), with Fe(PMe3)(4). (1: R1 = R2 = H; 2: R1 = H, R2 = SiMe3; 3: R1 = CH3, R-2 = 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)(3)SiH as a hydrogen source under mild conditions.