Formylcyclopentadienyl-(cyclopentadienyl) -iron, the first ferrocene derivative bearing an aldehyde function, has been synthesized by reaction of ferrocene with N-methylformanilide. A number of new diacylferrocenes have also been prepared by the Friedel-Crafts reaction. These new acyl derivatives, as well as the known acetylferrocene and diacetylferrocene, undergo many reactions characteristic of the carbonyl group.

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