Preparation of cobalt-containing bulky monodentate phosphines with electron-withdrawing/donating substituents on bridged arylethynyl and their applications in Suzuki coupling reactions

The strong electron-withdrawing substituents assist the ortho-metalation process during the formation of 5. The more positively charged palladium centers in 5 enhance the probability for PhB(OH)3− to attack the metal center and the rate of reduction thereafter in 5 catalyzed Suzuki reaction.