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The relative-rate technique has been used to obtain rates coefficients for the reactions of (E)-3- pentenenitrile (CH3CHaCHCHCN) and 4-pentenenitrile (CH2aCHCH2CH2CN) with OH radicals and Cl atoms at 298 K and (760 10) Torr total pressure of synthetic air using different reference compounds. The experiments were performed in an environmental chamber with ?in situ? FTIR spectroscopy to monitor the reactants concentrations. The following room temperature rate coefficients (in cm3 moleculeficients for the reactions of (E)-3- pentenenitrile (CH3CHaCHCHCN) and 4-pentenenitrile (CH2aCHCH2CH2CN) with OH radicals and Cl atoms at 298 K and (760 10) Torr total pressure of synthetic air using different reference compounds. The experiments were performed in an environmental chamber with ?in situ? FTIR spectroscopy to monitor the reactants concentrations. The following room temperature rate coefficients (in cm3 molecule3CHaCHCHCN) and 4-pentenenitrile (CH2aCHCH2CH2CN) with OH radicals and Cl atoms at 298 K and (760 10) Torr total pressure of synthetic air using different reference compounds. The experiments were performed in an environmental chamber with ?in situ? FTIR spectroscopy to monitor the reactants concentrations. The following room temperature rate coefficients (in cm3 molecule 10) Torr total pressure of synthetic air using different reference compounds. The experiments were performed in an environmental chamber with ?in situ? FTIR spectroscopy to monitor the reactants concentrations. The following room temperature rate coefficients (in cm3 molecule?in situ? FTIR spectroscopy to monitor the reactants concentrations. The following room temperature rate coefficients (in cm3 moleculeficients (in cm3 molecule 1 s1) were obtained: k1 (OH þ CH3CHaCHCHCN) ¼ (5.05 1.10) 1011, k21 s1) were obtained: k1 (OH þ CH3CHaCHCHCN) ¼ (5.05 1.10) 1011, k2 (Cl þ CH3CHaCHCHCN) ¼ (2.60 0.26) 1010, k3 (OH þ CH2aCHCH2CH2CN) ¼ (2.90 0.64) 1011þ CH3CHaCHCHCN) ¼ (2.60 0.26) 1010, k3 (OH þ CH2aCHCH2CH2CN) ¼ (2.90 0.64) 1011 and k4 (Cl þ CH2aCHCH2CH2CN) ¼ (2.56 0.26) 1010. This is the first kinetic study for all of these reactions. The effect of atom or group substituent on the overall rate coefficients is analyzed and the reactivity of nitriles is compared with those of other unsaturated compounds in the literature. In addition, a comparison between the experimentally determined rate coefficients from this work and thek4 (Cl þ CH2aCHCH2CH2CN) ¼ (2.56 0.26) 1010. This is the first kinetic study for all of these reactions. The effect of atom or group substituent on the overall rate coefficients is analyzed and the reactivity of nitriles is compared with those of other unsaturated compounds in the literature. In addition, a comparison between the experimentally determined rate coefficients from this work and theficients is analyzed and the reactivity of nitriles is compared with those of other unsaturated compounds in the literature. In addition, a comparison between the experimentally determined rate coefficients from this work and theficients from this work and the kOH and kCl predicted from k vs EHOMO correlations is presented. The atmospheric lifetimes at room temperature of these compounds has been estimated using the rate coefficients determined in this work.OH and kCl predicted from k vs EHOMO correlations is presented. The atmospheric lifetimes at room temperature of these compounds has been estimated using the rate coefficients determined in this work.ficients determined in this work.