Extrusion of Boron(III) Subporphyrin from meso‐Heptakis(pentafluorophenyl)[32]heptaphyrin upon Cooperative CuII and BIII Metalation

An uneven split: Cooperative CuII and BIII metalation of meso-heptakis(pentafluorophenyl)[32]heptaphyrin (1) triggers an extrusion reaction to produce BIII meso-tris(pentafluorophenyl)[14]subporphyrin (2) along with a CuII porphyrin (3-Cu). Subporphyrin 2 exhibits unique optical properties that reflect the rotational restriction of its electron-withdrawing substituents.