Stability of the metal-carbon a bond

Monomolecular dissociation of metal-alkyl complexes in which the metal-carbon bond is broken, often assisted by solvent, is considered to be one of the most important reactions of metal complexes  

This reaction can compete with the homolytic dissociation  

The metal-carbon bond is also strong in the [Cr(CH2PhMc2)4] and [Mo2(CH2SiMc3)6] complexes.  

It was first considered that the metal-carbon a bond is, by its nature, unstable in the thermodynamic sense, and if kinetic stability is present, it is due to the n bonding of large ligands. 

However, it has been shown that the metal-carbon a bond of the transition metal complexes is thermodynamically more stable than that of the main group metals. It was concluded that kinetically unstable complexes with the metal-carbon a bond can find a reaction path of low energy barriers. 

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