A general protocol for the title transformation has been achieved and is applicable to a wide range of acyclic 1,3‐dienes and cyclic alkyne—Co2(CO)6} complexes leading to various types of benzannulated medium‐sized cyclic compounds after oxidative work up (see scheme; DDQ=2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone). Interestingly, the [4+2] cycloaddition proceeded preferentially over the Pauson–Khand