New tricarbonyl(amido-substituted-1,3-diene)iron complexes

X-substituded benzamides (X = H; 2-OH; 4-MeO; 3-MeO; 3,5-(MeO) 2 ; 4-Cl and 2,4-Cl 2 ) have been shown to add reversibly to the dienyl rings of the organometallic compounds [(dienyl)Fe(CO) 3 ]BF 4 (dienyl = C 6 H 7 , 2-MeOC 6 H 6 or C 7 H 9 ) to give the corresponding cationic tricarbonyl(substituted-diene)iron complexes.