Facile Preparation of β‑Haloporphyrins as Useful Precursors of β‑Substituted Porphyrins

β-Haloporphyrins were efficiently prepared by halogenation of β-borylporphyrins with N-halosuccinimide and copper­(I) halide. β-Haloporphyrins are useful precursors to synthesize a wide variety of β-substituted porphyrins through Pd-catalyzed cross-coupling reactions.