FIGURE 6.11 Arrhenius plots of log k vs 1000/T for the reaction of OH with toluene and 1,2,3-trimethylbenzene: (•) exponential OH decays observed; (x) nonexponential OH decays observed (adapted from Perry et al., 1977).

The temperature dependence is that expected for a hydrogen abstraction; i.e., the rate constant increases with temperature (left side of Fig. 6.11).

As the temperature is lowered, the abstraction slows down but another reaction, addition of OH to the aromatic ring, takes place:

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