Rate coefficients for reactions of ground-state oxygen atoms with isobutene, trans-2-butene, and cis-2-butene have been measured using the high-temperature photochemistry (HTP) technique. The oxygen atoms were generated by flash photolysis of either O-2 or CO2 and the relative atom concentrations were monitored by resonance fluorescence. We find, in cm(3) molecule(-1) s(-1) units, for isobutene, k(284-1015 K) = 2.0 x 10(-15). (T/K)(1.28) exp(543 K/T); trans-2-butene, k(292-1022 K) = 3.9 X 10(-17)(T/K)(1.87) exp(743 K/T); and cis-2-butene, k(292-1086 K) = 2.4 X 10(-17)(T/K)(1.94) exp(716 K/T). The 2 sigma precision limits are around +/-10%, and the corresponding 2 sigma accuracy limits are estimated to be about +/-25%. Conventional transition-state-theory calculations for the electrophilic O-addition to the double bond yield at high temperatures rate coefficients smaller than observed. A method is developed for estimating rate coefficients for H abstraction. When the results are added to those of the addition, good agreement with experiments is attained. The differences between the k(T) expressions for the present three reactions and the corresponding 1-butene reaction are discussed in terms of the electronic effects of alkyl substituents on the double bond, and the greater curvature of the addition reaction Arrhenius plot and faster H abstraction for 1-butene. Based on these observations, a method is presented for estimating rate coefficients for O-atom reactions with higher olefins over wide temperature ranges.