1,1-Diphosphines and divinylphosphines via base catalyzed hydrophosphination

Abstract

A catalytic hydrophosphination route to 1,1-diphosphines is yet to be reported: these narrow bite angle pro-ligands have been used to great effect as ligands in homogeneous catalysis. We herein demonstrate that terminal alkynes readily undergo double hydrophosphination with HPPh₂ and catalytic potassium hexamethyldisilazane (KHMDS) to generate 1,1-diphosphines. A change to H₂PPh leads to the formation of P,P-divinyl phosphines.