Rate constants for the gas‐phase reaction of hexamethylbenzene with OH radicals and H atoms and of 1,3,5‐trimethylbenzene with H atoms

Rate constants for the gas‐phase reaction of hexamethylbenzene (HMB) with OH radicals and H atoms and of 1,3,5‐trimethylbenzene (TMB) with H atoms have been obtained in a flow system at 295 ± 2 K and a pressure of 25 mbar He using MS measurements. Obtained rate constants from a relative rate technique are k_(OH+HMB) = (1.13 ± 0.11) 10^?10, k_(H+HMB) = (5.9 ± 3.4) 10^?13 and k_(H+TMB) = (4.6 ± 2.7) 10^?13 cm³ molecule^?1 s^?1, respectively. © 2001 John Wiley & Sons, Inc. Int J Chem Kinet 33: 124–129, 2001