抄録
Studies have been made on the equilibrium of the complex formation reaction of toluene with hydrogen fluoride and boron trifluoride, and also on the kinetics of the formation of p-tolualdehyde from that complex with carbon monoxide in this system.
The existence of the complex (C7H9+•BF4-) has already been proven by Olah et al., and they are believed to be in equilibrium with the dissociated ions C7H9+ and BF4-. In this study equilibrium constants have been determined for the complex formation and also for the ionic dissociation, viz., 9×102 (mole fraction unit) at 0°C for the former and about 10-5 at 0°C for the latter.
As to the reaction of toluene with carbon monoxide, it has been found that, in the case of higher concentration of toluene (higher than 0.1M/l) the gas-liquid contact is rate-determining, but below that concentration the reaction between the dissolved reactants becomes rate-determining. The rate of the liquid phase reaction is of the first order with regard to the dissolved carbon monoxide and to the salttype complex, respectively. The rate constant of this reaction has been found to be 8.1×10-2(kg/cm2)-1 min-1 at 0°C, and the activation energy roughly 13kcal/mole.
