catalytic synthesis of nonracemic 
 p - chiral phosphine derivatives 
 remains a significant challenge . 
 here we report cu - catalyzed enantioselective 
 arylation of secondary phosphine oxides with diaryliodonium salts 
 for the synthesis of tertiary phosphine oxides with high enantiomeric 
 excess . 
 the new process is demonstrated on a wide range of substrates 
 and leads to products that are well - established p - chiral catalysts 
 and ligands .