Migration between Different Ligand Sites

Metal Migration between Different Ligand Sites 

Ring whizzing and related behavior is frequently observed but has been little studied recently from a mechanistic viewpoint. However, the nmr spectra relating to the fluxional behavior of [M(CO)3(T] -cot)] (M = Cr or W) have been reexamined and interpreted in terms of combinations of 1,2 and 1,3 shifts. 

The trityl complex [Pd(acac)(Ti -CPh3)] 28 shows three distinct dynamic 

Hydrogen Migrations Involving Hydrogen Bound to Carbon 

Intramolecular hydrogen migration between carbon and metal atoms is, of course, important to various catalytic reactions and may be sufficiently fast to give nmr coalescence. Treatment of compound 29 with D2O in CD3NO3 at 

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Metal Migration between Different Ligand Sites... 

Migration of Metal Atoms between Different Ligand Sites 345... 

A related process involving C-H activation in palladium center is the shift of a hydrogen between two different sites of an organic ligand, coupled with a shift of the metal from a vinyl site to an aryl site [61-63]. In this case, two different processes were found to be feasible (Fig. 11.12). The oxidative path is composed of two steps with the highest barrier of 140 kJ/mol. The one step migration with a constant oxidation state has a lower barrier of 95 kJ/mol. 

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