Figure 2. (A) Reaction conditions that result in the formation of R1-meta-carborane regioisomers. (B) 11B NMR spectra of the isolated regioisomers. Singlet resonances (no 11B−1H coupling) corresponding to the B−O-bonded vertex are labeled; all other resonances correspond to doublet resonances arising from 11B−1H couplings. (C) Single-crystal X-ray structures of R1-B(n), n = 2, 4, 5, 9 (ellipsoids drawn at 50% probability and H atoms omitted for clarity).
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