halides (HF, HCl, HI) do not behave in the manner described above. The resulting 1-bromoalkanes are versatile alkylating agents. By reaction with dimethyl amine, they are precursors to fatty tertiary amines. By reaction with tertiary amines, long-chain alkyl bromides such as 1-bromododecane, give quaternary ammonium salts, which are used as phase transfer catalysts. With Michael acceptors the addition is also anti-Markovnikov because now a nucleophilic X− reacts in a nucleophilic conjugate addition for example in the reaction of HCl with acrolein. Scope Recent research has found that adding silica gel or alumina to H-Cl (or H-Br) in dichloromethane increases the rate of reaction making it an easy one to carry out. References Addition reactions de:Elektrophile Addition