iridium (III) chloride trihydrate; oxygen; sodium carbonate; triphenylphosphine in 1,3,5-trimethyl-benzene T=169°C; 15 h;

1: With zinc trifluoromethanesulfonate T=20°C; 1 h; Inert atmosphere; 2: With 1,1'-bis-(diphenylphosphino)ferrocene; tri-ruthenium(0)dodecacarbonyl; toluene-4-sulfonic acid in 1,4-dioxane T=150°C; 22 h; Inert atmosphere;

sodium acetate; acetic acid in dichloromethane; water 2 h; Reflux;