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%.
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