Rate Constants of the Reactions of CHCl (X̃1A′) with Ethylene, Propylene, and Acetylene

The rate constants of the reactions of CHCl (X 1 A') with C 2 H 2 (k 4 ), C 2 H 4 (k 5 ) and C 3 H 6 (k 6 ) were measured as a function of temperature. Experiments were carried out under quasistationary conditions at around 18.5 mbar total pressure. It is shown that excimer laser photolysis of CF 2 =CHCl at γ pH = 193 nm is a suitable source for CHCl (X 1 A') generation. The following rate constants were obtained from logarithm plots: k 4 = (4.2 ±0.1). 10 2 (T/295 K) -(0.79±0.06) cm 3 mol -1 s -1 k 5 = (3.2±0.2).10 12 (T/295 K) -(l.52±0.12) cm 3 mol -1 s -1 k 6 = (8.3±1.4).10 12 (T/295 K) -(1.39±0.05) cm 3 mol -1 s -1 The reactivity of CHCl (X 1 A') is compared to those of other carbenes.