sulfuric acid in benzene 22 h; Heating;

carbon monoxide; 1,3-bis-(diphenylphosphino)propane; 1,10-phenanthroline monohydrate; bis(dibenzylideneacetone)-palladium(0) in N,N-dimethyl-formamide T=120°C; P=4560.31 Torr; 22 h;