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.