" k = Ae-':</RT; valid only for the 250-425 K range. b From Atkinson (1997a).

' High-pressure limiting rate constants (k.,) except for C2H4 and C3H d From Atkinson (1994). ' See Fig. 6.22 for structures of biogenics.

These observations are consistent with the primary reaction path being addition of OH to the double bond to form an adduct or intermediate that can decompose back to the reactants, or be stabilized:

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