Absolute rate constant for the reaction of OH with thiophene between 293 and 473 K

The rate parameters of the OH + C₄H₄S (thiophene) reaction were measured at a pressure of 0.5 Torr in the temperature range 293–473 K by the discharge flow EPR method. The reaction was found to exhibit a negative temperature dependence. The data fit the Arrhenius expression k = (1.3 ± 0.8) × 10^?13 exp[(1750 ± 200)/T] cm³ molecule^?1 s^?1. The rate constant of (5 ± 0.4) × 10^?11 at room temperature corresponds to a short lifetime of C₄H₄S in the atmosphere.