AbstractDirect reaction of iron pentacarbonyl with 1‐N,N‐disubstituted‐cyclohexa‐2,5‐dicnecarboxamide and 1‐N,N‐disubstituted‐cyclohexa‐1,3‐dienecarboxamide mixture (in which the disubstkuted group is diethyl or diphenyl) gave the isomeric tricarbonyl iron complexes of 2‐N,N‐disubstituted‐1,4‐η‐cyclohexa‐1,3‐dienccarboxamide (1), 1‐N,N‐disubslituted‐1,4‐η‐cyclohexa‐1,3‐dienecarboxamide (2), and5‐N,N‐disubstituted‐1,4‐η‐cyclohexa‐1,3‐dienecarboxamide (3) and tricarbonyliron complexes of l‐N,N‐disubstituted‐cyclohexenecarboxamide (4). These complexes were separated and characterized by IR, UV‐VIS,1H NMR, elemental analysis, and mass spectra. Only 1 isomerized to give 2 under acidic conditions; both 1 and 2 undergo hydride abstraction with triphenylmethyl hexafluorophosphatc. Complexes 3, undergo neither isomcrization nor hydride abstraction. According to the spectral data, the possible interaction between carboxamide and iron carbonyl moiety was investigated. T