From the 12 resonances in the 1 H NMR spectrum of complex 2, 5 integrate to 9H each, indicating 5 magnetically inequivalent tBugroups. The other 7 resonances integrate to 1H, consistent with the presence of 7 magnetically inequivalent protons on the ligand backbone. The inequivalence of the tBu-groups as well as the presence of two signals for the methylene linker in 2 is indicative of a non-symmetric complex similar to 1.