The reaction of chlorine atoms with bromomethyl methyl ether, BrCH2OCH3, was studied with the very low pressure reactor (VLPR) technique in the temperature range 273-363 K. The absolute rate constant was found to be independent of temperature and its value was (2.61 +/- 0.46) x 10(-11) cm(3) molecule(-1) s(-1). Conventional transition state theory suggests that the reaction proceeds mainly via the metathesis of a hydrogen atom from the substituted ether side.