Dynamic Stereochemistry of Terminally Substituted π-Allyl Complexes of Molybdenum with the Tp‘ Ligand: NMR Evidence for π−σ−π Interconversion†

NMR spectroscopic evidence is provided for a π−σ−π interconversion in fluxional, mono- and 1,3-disubstituted π-allyl molybdenum complexes containing the hydrotris(3,5-dimethylpyrazolyl)borate ligand.