The reactions of [Fe(CO),(q3-C,H5)X] (X = Br or I) with Ag[C104] in dichloromethane yielded the perchlorate-bonded complex [ Fe(C0),(q3-C3H5) (OCIO,)] (3). Complex (3) is a suitable precursor for the synthesis of the cationic complexes [Fe(CO),(?3-C3H5)L] [C104] (L = PPh,, AsPh3, and pyridine). [Fe(CO),(q3-C,H5) ( PPh,)] [C104] reacts with univalent bidentate ligands (L' = acetylacetonate, 8hydroxyquinolinate, and N-phenylsalicylaldiminate) t o give the neutral complexes [Fe(CO) (o-C3H5) (PPh3)L'].The study of the reactivity of the q3-and o-ally1 transitionmetal complexes is significant because of their involvement in many catalytic processes. Little work is available on the synthesis and reactivity of cationic ally1 iron carbonyl complexes.1*2 In the present paper we describe the reactions of [Fe(CO),(q3-C3H5)X] (X = Br or I) leading to the successful isolation of cationic and neutral q3-and o-ally1 iron carbonyl complexes.

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