"A Dramatic Steric Effect on the Rate of Migratory CO Insertion on Rhodium"
L. Gonsalvi, H. Adams, G J. Sunley, E. Ditzel and A. Haynes
J. Am. Chem. Soc., 1999, 121, 11233 

Rotatable x-ray structures (Jmol)

[Ir(CO)(dppms)I₂Me] Note the steric congestion around the methyl ligand created by two dppms phenyl substituents. (Switch to space-filling mode to see more easily).



[Rh(dppms)I₂(COMe)] In this square pyramidal complex, two phenyl groups create steric congestion around the vacant coordination site.



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