Cationic cycloheptadienyl ironcomplexes with new substitution patterns are generated by starting from the eucarvonecomplex 5 and the analogous triphenyl phosphite complex 6. These complexes are converted with different nucleophiles. Regioselectivity of the nucleophilic attack depends on the substitution pattern of the seven-membered ring. A new type of cationic system 7b, bearing an alkoxy substituent