The carbamates (III) were prepared either by reacting the azatadine derivatives (I) with the chloroformate (II) or by treatment of the phenylester (III) (R: ‐Ph) with the appropriate alkoxide (IV).

to our colleagues, Profs. D. Locke (Queens), G. Quigley, and M. Blumenstein (Hunter) for their invaluable technical assistance.Supplementary Material Available: X-ray crystallography material for urethane 15 (10 pages). Ordering information is given on any current masthead page.

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Summary3 H-Sch 58235 was prepared at a specific activity of 29.1 Ci/mmol by Ir(COD)(Cy 3 P)PyPF 6 catalysed exchange with tritium gas.14 C-Sch 58235 was prepared in three steps from p-hydroxy[ring-U-14 C]benzaldehyde with an overall radiochemical yield of 21%. 13 C 6 -Sch 58235 was similarly prepared in three steps from p-hydroxy[ring-U-13 C 6 ]benzaldehyde in an overall yield of 41%.

Der durch Behandlung des zweikernigen trans‐Fe‐Komplexes (I) mit Tritylhexafluorophosphat dargestellte Titelkomplex (II) ist das erste Beispiel eines Komplexes mit Dihaptocyclobutadienoid‐Liganden; ein analoges Zwischenprodukt wird bei der oxidativen Zersetzung von Tetrahaptocyclobutadienoid‐tricarbonyl‐Fe angenommen.