Abstract
The proton magnetic resonance spectra of a series of bis(arene)chromium(0) complexes have been investigated. Simple first order spectra are obtained in most cases, for which chemical shift assignments are reported. A significant reduction in J(HH)-values, relative to the free ligand, are observed for the complexed arenes; HH coupling is limited to adjacent hydrogen atoms. In fluorobenzene complexes, HF coupling is so diminished as not to be observed in the majority of our spectra. Meta disubstituted arenes, in which the substituents are not identical, yield two diastereomeric bis(arene)chromium(0) complexes from the metal atom synthesis which can be distinguished on the basis of their PMR spectra.
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