π‐Pyrrole–Metal Complexes—The Missing Coordination Mode for Metal–Porphyrin Interactions

Metal–porphyrin π bonds such as those in 1 and 2 were hitherto unknown modes of coordination in porphyrin complexes. However, arene complexes of this kind were recently synthesized by Rauchfuss et al. (Angew. Chem. Int. Ed. Engl. 1996, 35, 1833). Metal – porphyrin interactions of this type may also play a role in reactions catalyzed by metalloporphyrins.