"Theoretical and Experimental Evidence for S_N2 Transition States in Oxidative Addition of Methyl Iodide to cis-[M(CO)₂I₂]^- (M = Rh, Ir)"
T.R. Griffin, D.B. Cook, A. Haynes, J.M. Pearson, D. Monti, G.E. Morris
J. Am. Chem. Soc., 1996, 118, 3029  

Rotatable ab initio structures (Jmol)

"Linear" transition state for S_N2 attack by [Rh(CO)₂I₂]^- on CH₃I, the rate determining step in rhodium/iodide catalysed methanol carbonylation (the "Monsanto Process").

An alternative "bent" transition state of higher energy.

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