The kinetics of the title reaction were investigated between 293 and 730 K at 740 ( 10 Torr in a helium bath gas. Absolute rate measurements were obtained using a laser photolysis/laser-induced fluorescence (LP/LIF) technique under slow flow conditions. Rate coefficients exhibited complex behavior with negative temperature dependence at temperatures below 560 K, a rapid drop in rate between 560 and 620 K, and a positive temperature dependence above 620 K. The simple Arrhenius equation adequately describes the data at and below 560 K and is given by (in units of cm 3 molecule -1 s -1 ) k(293-560 K) ) (2.72 ( 0.35) × 10 -12 exp(335 ( 42)/T. Error limits are 2σ values. The low-temperature values for k are within (2σ of the most recent measurements of this reaction obtained under atmospheric pressure conditions. Above 620 K, our measurement combined with the recent measurements of Liu et al. 8 to yield the following rate expression: k(620-1173 K) ) (6.3 ( 4.0) × 10 -11 exp(-2740 ( 490)/T. Error limits are 2σ values. The rate data were interpreted using variational transition state theory and QRRK theory. OH addition to the site followed by adduct stabilization describes the low-temperature measurements. Ab initio-based transition state calculations for the H abstraction channel indicated that this mechanism is consistent with the rate measurements above 620 K. H abstraction is predicted to be the dominant reaction channel above temperatures of 800 K.