The ruthenocene derivatives of different biogenic amines labelled with 103RU in the ruthenocene moity were synthesized. In a first step the central atom of ferrocene was exchanged with 103RuCl3 yielding [103RU]‐ruthenocene, by vilsmeier‐formylation the radioactive ruthenocene aldehyde was synthesized which was condensed with the desired amine to the Schiff'sche base, followed by the reduction of the CN double bond by NaBH4.
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