Kinetics of the OH and Cl reactions with N-methylformamide, N, N-dimethylformamide and N, N-dimethylacetamide

Abstract

A relative kinetic technique was used in combination with long-path Fourier transform infrared spectroscopy to study the kinetics of the reactions of N-methylformamide (HC(O)NHCH 3), N, N-dimethylformamide (HC(O)N(CH 3) 2) and N, N-dimethylacetamide (CH 3C(O)N(CH 3) 2) with OH radicals and Cl atoms at 298 ± 2 K and atmospheric pressure 1000 ± 10 mbar of air. The measured OH and Cl reaction rate coefficients (in units of cm 3 molecule −1 s −1) were, respectively, (0.86 ± 0.24) × 10 −11 and (0.97 ± 0.17) × 10 −10 for N-methylformamide, (1.4 ± 0.3) × 10 −11 and (1.9 ± 0.3) × 10 −10 for N, N-dimethylformamide, (1.9 ± 0.3) × 10 −11 and (2.5 ± 0.4) × 10 −10 for N, N-dimethylacetamide. The results are presented and discussed in terms of structure–activity relationships and the atmospheric impact of the amides.