Isotopic Exchange Reactions. The Halogen Exchange between SiCl4 and HCl

The kinetics of the isotopic chlorine exchange between SiCl4 and HCl have been measured using the tracer Cl36. The reaction is first order in HCl and second order in SiCl4. E‡ and S‡ are 22.4 K cal mole—1 and —17.6 cal deg—1 mole—1, respectively. A mechanism for the exchange is proposed.