Formation accompanying homolytic dissociation

Olefin Formation Accompanying Homolytic Transition Metal-Alkyl Bond Dissociation... 

Processes accompanied by a decrease in volume, such as C—C bond formation, in which the distance between two carbon atoms decreases from the van der Waals distance of ca 3.6 A to the bonding distance of ca 1.5 A, are accelerated by raising the pressure and equilibria are shifted toward the side of products (AV < 0, AV < 0). The reverse reaction, a homolytic bond cleavage, leads to an increase in volume (AV / > 0, AV > 0). Pressure induces a deceleration of such a process and a shift in equilibrium toward the side of reactants. However, in an ionization, such as an ionic dissociation, the attractive interaction between the ions generated and the solvent molecules leads to a contraction... 

For metal complexes of alkyls containing 3-hydrogen atoms, metal-alkyl homolytic bond dissociation often is accompanied by olefin formation. An example ( ) Is provided by Equation 30 (Saloph = N,N -bid(salicylidene)-o-phenylenediamine). 

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