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1H–13C HMBC spectra of Zr4O2(OMc)6(OPiv)6 obtained by (a) ligand exchange of Zr4 and (b) by scrambling reaction between Zr4 and Zr4Piv in toluene; NOESY spectra of Zr4O2(OMc)6(OPiv)6 obtained by (c) ligand exchange and (d) by scrambling between Zr4 and Zr4Piv in toluene. All spectra were recorded at –80 °C with samples in [D8]toluene.
