halogenarea alcanilor decurge fie la lumina sau la intuneric la 500°C si se poate face direct cu Cl2 (clorurare) si Br2 (bromurare)
CH4 + Br2 => CH3Br + HBr
CH4 + 2Br2 => CH2Br2 + 2HBr
CH4 + 3Br2 => CHBr3 + 3HBr
CH4 + 4Br2 => CBr4 + 4HBr
CH3Br = bromometan (bromura de metil)
CH2Br2 = dibromometan (bromura de metilen)
CHBr3 = tribromometan (bromura de metin / bromoform)
CBr4 = tetrabromometan
