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Reaction of [(CO) 2 W(NPh)I 2 ] 2 ( 1 ) with 2 equiv of piperidine yielded (CO) 2 W(NPh)I 2 (pip). In the presence of excess amine, secondary amines (R 2 NH) were carbonylated to the formamides R 2 NCHO while primary amines (R‘NH 2 ) were converted to the ureas R‘NHCONHR‘.
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McCusker et al. (1997) studied this question.
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