hydrogen; [rhodium(I)(carbonyl)2(acetylacetonate)]; 6,6'-[[3,3',5,5'-tetrakis(1,1-dimethylethyl)-[1,1'-biphenyl]-2,2'-diyl]bis(oxy)]bis-dibenzo [d,f][1,3,2]-dioxaphosphepine in tetrahydrofuran T=75°C; P=20702.1 Torr; 18 h;