Monodentate phosphine ligands mainly affect the electron density of metal catalysts through the electron donation ability of phosphorus atoms and are widely used in organometallic catalytic reactions, especially C-C coupling reactions, hydrogenation reactions, etc. Due to their strong stability and specific electronic effects, phosphine oxide ligands are suitable for reactions that require stabilizing metal intermediates or adjusting the electronic properties of catalysts. Both types of ligands play an irreplaceable role in the field of organometallic chemistry and catalysis. By selecting appropriate ligands, the performance of metal catalysts can be adjusted, thereby controlling the efficiency and selectivity of chemical reactions.