Rh(acac)(CO)2; 3,3',5,5'-tetra(2,4-difluorophenyl)-2,2',6,6'-tetra((di-1-pyrrolylphosphino)oxy)-1,1'-biphenyl; hydrogen in toluene T=120°C; P=3800.26 Torr; 2 h; Autoclave; regioselective reaction;