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US 6,646,165 B2Granted
Process for producing bishalophenyl disulfide
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsTakehiro Hiyama, Hitoshi Karino, Shinji Nii
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Abstract
This invention is directed to a process for producing a bishalophenyl disulfide, chracterized by reacting a halothiophenol with an alkali metal hydroxide to obtain an alkali metal halothiophenolate and subsequently converting the halothiophenolate into a disulfide with an oxidizing agent in the presence of a mineral acid. By the process, a bishalophenyl disulfide having a high purity can be industrially produced in high yield.
Claims7
A process for producing a bishalophenyl disulfide represented by the formula (3)
- wherein X1 is a halogen atom and X2 is a halogen atom or a hydrogen atom, the process comprising the steps of reacting a halothiophenol represented by the formula (1)
- wherein X1 and X2 are as defined above with an alkali metal hydroxide to obtain an alkali metal halothiophenolate represented by the formula (2)
- wherein X1 and X2 are as defined above, and M is an alkali metal atom and subsequently converting the alkali metal halothiophenolate into a disulfide with an oxidizing agent in the presence of a mineral acid.
A process for producing a halothiophenol represented by the formula (1)
- wherein X1 is a halogen atom and X2 is a halogen atom or a hydrogen atom, the process comprising the steps of reacting a halobenzene represented by the formula (4)
- wherein X1 and X2 are as defined above, and X3 is a halogen atom, with sodium thiomethoxide in the presence of a quaternary phosphonium salt to obtain a methylthiohalobenzene represented by the formula (5)
- wherein X1 and X2 are as defined above, chlorinating the obtained methylthiohalobenzene with chlorine to obtain a chloromethylthiohalobenzene represented by the formula (6)
- wherein X1 and X2 are as defined above, and n is an integer of 1 to 3, and hydrolyzing the obtained chloromethylthiohalobenzene in the presence of a lower alcohol or a base.
1 more element
Dependencies are inferred from the claim text.