# Why do polarizable nucleophiles favor SN2 over E2?

Weakly basic ions and polarizable bases favor $$\mathrm{S_{N}2}$$ over $$\mathrm{E2}$$. Why? The argument used that polarizable nucleophiles form bonds earlier, stabilizing the transition state, can be applied to either $$\mathrm{S_{N}2}$$ or $$\mathrm{E2}$$.