In this publication we report: (i) the rate constants for reaction of the hydrated electron with 1-hexyn-3-ol ((8.6 ± 0.3) × 108 dm3mol−1s−1at 18 °C), cinnamonitrile ((2.3 ± 0.2) × 1010 dm3 mol−1s−1at 20 °C), and 1,3-diethyl-2-thiourea ((3.5 ± 0.3) × 108 dm3 mol−1s−1at 22 °C). For cinnamonitrile and diethylthiourea, the temperature dependence up to 200 °C and 150 °C, respectively, is also reported; (ii) the rate constants for the reaction of the hydroxyl radical with 1-hexyn-3-ol ((5.5 ± 0.5) × 109 dm3 mol−1s−1at 20 °C), cinnamonitrile ((9.2 ± 0.3) × 109 dm3 mol−1s−1at 21 °C), and diethylthiourea ((8.0 ± 0.8) × 108dm3 mol−1s−1at 22 °C). For cinnamonitrile, the temperature dependence up to 200 °C is also reported; (iii) the rate constant for the hydrogen atom reacting with 1-hexyn-3-ol ((4.3 ± 0.4) × 109 dm3 mol−1s−1at 20 °C).Keywords: radiolysis, corrosion inhibitors, rate constants.