The gas-phase reactions of NO3 radicals with series of 1-alkenes, dienes, cycloalkenes, alkenols, and alkenals were studied in pure N-2 or 20% O-2/80% N-2 bath gas at room temperature and atmospheric pressure using a relative rates technique. Rate coefficients were derived from rates of loss of the organic compounds observed using a chemical ionization mass spectrometer. No difference in the measured kinetic data was observed in the presence or absence of O-2. The rate coefficients obtained (k (10(-13) cm(3) molecule(-1) s(-1)), with uncertainties representing 95% confidence intervals) are as follows: 1-hexene, 0.233 +/- 0.021; 1-heptene, 0.245 +/- 0.029; 1-octene, 0.292 +/- 0.044; 1,3-butadiene, 1.24 +/- 0.09; isoprene, 6.24 +/- 0.11; 2,3-dimethyl-1,3-butadiene, 14.1 +/- 0.5; 1,3-cyclohexadiene, 112 +/- 8; cyclopentene, 4.82 +/- 0.13; cyclohexene, 5.38 +/- 0.20; cycloheptene, 5.28 +/- 0.23; 2-buten-1-ol (crotyl alcohol), 3.23 +/- 0.12; cis-2-penten-1-ol, 3.11 +/- 0.11; cis-2-hexen-1-ol, 3.81 +/- 0.38; trans-2-pentenal, 0.193 +/- 0.040; trans-2-hexenal, 0.136 +/- 0.029; trans-2-heptenal, 0.231 +/- 0.036; cis-4-heptenal, 4.03 +/- 0.24. The measured rate coefficients are compared to values from previous studies and three structure-activity relationships (SARs), and good agreement is found, in general. In particular, the recently developed SAR of Kerdouci et al. (Kerdouci, J.; Picquet-Varrault, B.; Doussin, J. ChemPhysChem 2010, 11, 3909-3920.) is found to estimate the rate coefficients within 35% for all of the measured reactions except for NO3 + 1,3-butadiene. The SAR prediction for that reaction is nearly 50% lower than the measured value, suggesting that it underestimates the effect of conjugation on the reaction of NO3 with this small diene. The measured rate coefficients for reactions with a series of alkenols are used to modify the SAR substituent factor for the -CH2OH group, and those for reactions with a series of trans-2-alkenals are used to derive a substituent factor for the -C(O)H group, which was not included in the original SAR because of insufficient experimental data.