Reaction of [(CO)(2)W(NPh)I-2](2) (1) with 2 equiv of piperidine yield
ed (CO)(2)W(NPh)I-2(pip). In the presence of excess amine, secondary a
mines (R2NH) were carbonylated to the formamides R2NCHO while primary
amines (R'NH2) were converted to the ureas R'NH-CONHR'.