Other possibilities for the electrophile include (chloromethyl)oxonium cation (ClH2C–OH2+) or chlorocarbenium cation (ClCH2+), which may be formed in the presence of zinc chloride.
Other possible electrophilic reagents for this reaction include the (chloromethyl)oxonium cation (ClH2C–OH2+) and the chlorocarbenium cation (ClCH2+), which can be generated in the presence of zinc chloride.