Dehydrohalogenation by the E1 Mechanism
E1 dehydrohalogenation usually takes place in a good ionizing solvent such as an alcohol or water, without a strong nucleophile or base to force 2nd order kinetics. The substrate is usually as 2o or 3o alkyl halide. This reaction is generally accompanied by SN1 substitution because the nucleophilic solvent can also attack the carbocation directly.