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a) Synthesis of (ene)BBNtBuFeBr2 via post-metalation hydroboration and synthesis of 1 and 2–4 via pre-metalation hydroboration b) molecular structures (50% probability ellipsoids) of 1, (propargyl)BBNtBuFeBr2, (ene)BBNtBuFeBr2, and 2. H-atoms excluding (ene) and (propargyl) groups are omitted, and the 9-BBN substituents are displayed in wireframe for improved clarity.
