“…Norbornene and related systems are commonly used in the intermolecular Pauson–Khand reaction. Since the early reports of Pauson and co‐workers,23a–c in which they showed norbornenes to be the most successful alkene partners, there have been many examples of their use in the presence of different metals and under different reaction conditions,15b–f, 30c, f, 32b, g, 40, 68a in the asymmetric version of the reaction,28e,h, 32d, i, 41 and in heterogeneous systems 30g–i. 42 Related systems such as 8‐oxabicyclo[3.2.1]octenes28b, 43 and heteroatom‐containing bicyclo[2.2.1]heptenes,28f, 40b, p, 42a, 43c, 44, 45 reveal similar or slightly lower levels of reactivity.…”