carbon monoxide; triethyl phosphite; bis(η3-allyl-μ-chloropalladium(II)) in neat (no solvent) T=75°C; P=760 Torr; 12 h;

oxalyl dichloride; dimethyl sulfoxide; triethylamine 1.) ether, from -40 deg C to -35 deg C, 1 h, 2.) ether, a) -78 deg C, 1 h, b) 0 deg C, 2 h; Yield given. Multistep reaction;

1: 80 percent / diethyl ether; tetrahydrofuran / 0.5 h / 0 °C 2: 13 percent / BuLi, H2O / -40 °C View Scheme