Abstract
AbstractThe kinetics of the reaction CH2(X̄3B1) + C6H6 → products (1) has been studied in a discharge flow reactor using Laser Magnetic Resonance (LMR) detection for CH2. The experiments yielded the overall rate constant kexp1 = (4.7 ± 2.4) · 10t3 exp(−(37.5 ± 2.4) kJ mol−1/RT) in the temperature range 448 K ≦T ≦ 683 K. The product formation was investigated for reaction (1) as well as the corresponding reaction CH2(ã1A1) + C6H6 → products (2) in a stationary photolysis reactor employing gas chromatographic analysis by photolyzing mixtures of CH2CO and C6H6 at λ1 = 366 nm and λ2 = 313 nm. The relative yields of the products cycloheptatriene (CHT) and toluene (T) were found to depend on the wavelength, [T]/([CHT] + [T]) = (0.13 ± 0.02) and (0.23 ± 0.02) at λ1, and λ2, respectively. The implications of these results and the mechanisms are discussed.
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