Abstract
The preparation and temperature-dependent 1H n.m.r. spectra are reported for new chelated complexes [LM(CO)4][L = 1,2-bis(isopropylseleno)ethane; M = Cr, Mo, or W]. The well resolved n.m.r. spectra are interpreted by considering total inversion of the five-membered chelate-ring system but without invoking true inversion about the ligand donor atoms.
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