Patent ID: 7064213

Claim:
A method for preparing 2-(2-pyridylmethylsulphinyl) benzimidazole having the following formula [A], which comprises undergoing an oxidation reaction of an intermediate having the following formula [B] in a solvent and in the presence of a catalyst and an oxidant to form the compound [A]: wherein R 1 in [A] and [B] is hydrogen, halogen, C1–C6 alkyl, C1–C6 alkoxy, halogenated C1–C6 alkyl, or halogenated C1–C6 alkoxy; R 2 and R 3 independently are hydrogen, halogen, C1–C6 alkyl, C1–C6 alkoxy, halogenated C1–C6 alkyl, or halogenated C1–C6 alkoxy; and R 4 is hydrogen, C1–C6 alkyl, or halogenated C1–C6 alkyl; characterized in that said catalyst is acetyl acetonate of molybdenium (II).