Synthesis of Sterically Hindered Monophosphino-

Rh(I)-catalyzed B(3,6)-H arylation of monophosphino-o-carborane and a variety of aryl halides bearing ortho-substituted and di-ortho-substituted groups can be carried out under microwave irradiation. Sterically hindered B(3)-arylated and B(3,6)-diarylated products were obtained in 11-95% yields.