Abstract
Evidences of adduct formation between the dirhodium complex Rh2[(R)-MTPA4] (Rh–Rh; MTPA-H = Mosher acid) and various monovalent ligands L were obtained in solution by using NMR spectroscopy. Strongly binding ligands, e.g. selenoethers or nitriles, prefer L → Rh–Rh ← L adducts whereas weaker ligands, e.g. olefins with low steric hindrance, tend to form oligomers with bridging L molecules: ⋯Rh–Rh⋯L⋯Rh–Rh⋯. Larger steric congestion forces olefins to avoid bridge situations or even prohibits adduct formation at all.
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