Propagation reaction X RH — XH

Extensive information exists in the literature on the Arrhenius parameters for hydrogen abstraction from hydrocarbons and related com- 

Alkoxy radicals react rapidly with O2 or undergo homolysis with relatively low activation energies. 

The OH + RH data are considered so reliable that realistic attempts have been made to allow for the effect of near neighbour groups [51]. For example, for H abstraction from a CH2 group in an alkane, it is possible to assign specific Arrhenius parameters for the following environments as well as others, based on k = AT 

In a similar way, Atkinson [52-54] claims to have fitted rate constants to within a factor of 2 between 250 and 1000 K by consideration of CH3—, CH2—, and CH— as groups attacked and functioning as near-neighbour groups. For OH + alkane, 

Further factors are introduced for the reaction of OH with cycloalkanes [52,53]. Several critical reviews of the OH + RH data are available for wide temperature ranges [54, 55]. 

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