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Relatively high doses of methyl eugenol that overwhelm the most common metabolic pathways have been suggested as the mechanism resulting in the formation of a reactive carbonium ion from the 1'-hydroxymethyl eugenol metabolite (Gardner et al.
Formation of the 1'-hydroxyl metabolite is particularly important because it is thought to form a carbonium ion that results in a reactive intermediate molecule (Burkey et al.
This is particularly important because the 1'-hydroxy pathway is responsible for formation of the reactive carbonium ion.
The cracking rate of alkenes is much higher than that of alkanes following the carbonium ion mechanism, therefore, catalytic pyrolysis of C4 hydrocarbons at low temperature mainly follows the carbonium ion mechanism.
For the cracking of hydrocarbons, the selectivity of ethene and ethane following the carbonium ion mechanism is generally lower than that following the free radical mechanism.
Increasing temperature could improve both of the diffusion velocity of carbonium ions (+C[H.