However, while the TiCl 2 (O i Pr) 2 data can also be reasonably described by the FW model, this is not the case for TiCl(O i Pr) 3 , where the error on the fitted rate constant is higher than the value itself (Figures ). An initial rate analysis (Table ) shows that the decomposition rate of TiCl 3 (O i Pr) is about 10 times faster than that of TiCl(O i Pr) 3 . We can rationalize this again with Scheme 1. The transition state is stabilized by either stabilizing the positive charge on the carbocation or the negative charge on the leaving group (the titanium oxide complex). Replacing an electron donating isopropoxide with an electron withdrawing chloride makes the titanium more Lewis acidic, thus stabilizing the negative charge and accelerating the reaction. Therefore, varying the ratio of chloride to isopropoxide offers an alternative strategy for tuning the reaction kinetics.