bis-triphenylphosphine-palladium(II) chloride; 3,3',5,5'-tetra-tert-butyl-2,2'-di-hydroxy-1,1'-biphenyl; 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene in neat (no solvent) T=132°C; 3 h; Inert atmosphere;

carbon monoxide; 1,5-bis-(diphenylphosphino)-pentane; potassium iodide; iron(II) chloride T=240°C; P=15201 Torr; 3 h;

1: 73.5 percent / pyridine 2: 41 percent / Pb(OAc)4, pyridine / benzene / 4 h / Heating View Scheme

1: 1.) O3, 2.) KBH4, aq. NaOH / 1.) EtOH, hexane 2: 73.5 percent / pyridine 3: 41 percent / Pb(OAc)4, pyridine / benzene / 4 h / Heating View Scheme