N,N,N',N,-tetramethylethylenediamine; carbon monoxide; lithium diisopropyl amide 1a) THF, hexane, -78 deg -C, 10 min, 1b) 0 deg C, 10 min, 2a) THF, -60 to 25 deg C, 2b) 25 deg C, 1h; Yield given. Multistep reaction;