Method for producing sulfone derivatives

The method addresses the challenges of high costs and impurity issues in sulfone derivative production by using hydrogen peroxide or alkali metal persulfates, ensuring high yields and minimal sulfoxide byproducts, suitable for industrial herbicide production.

JP2026113564APending Publication Date: 2026-07-07KUMIAI CHEM IND CO LTD
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Patent Information

Application Number
JP2026059903
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-12-23
Filing Date
2026-04-01
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing methods for producing sulfone derivatives, such as pyroxasulfone, face challenges including high costs due to the use of expensive oxidizing agents like m-chloroperbenzoic acid, handling issues, and the presence of sulfoxide byproducts that are difficult to separate, leading to reduced product quality and potential phytotoxicity.

Method used

A method involving the oxidation of sulfide derivatives using hydrogen peroxide or alkali metal persulfates as oxidizing agents without transition metals, under specific conditions, effectively minimizing sulfoxide byproducts and enabling efficient industrial-scale production.

Benefits of technology

The method achieves high yields of sulfone derivatives with minimal sulfoxide impurities, is economically viable, and environmentally friendly, suitable for large-scale herbicide production.

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Abstract

This invention provides an industrially preferred method for producing sulfone derivatives and intermediates useful as herbicides. [Solution] A method for producing the compound of formula (8), comprising the following step ii: (Step ii) In the absence of a transition metal and in the presence of an acidic compound, the compound of formula (7) is reacted with an oxidizing agent to produce the compound of formula (8), where the acidic compound is sulfuric acid. TIFF2026113564000066.tif64161
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Citation Information

Patent Citations

  • Synthesis method and application of pyroxasulfone

    CN111574511A

  • Method for producing 5,5-disubstituted 4,5-dihydroisoxazole-3-thiocarboxamidine salts

    JP2013512201A

  • Isoxazoline derivative and herbicide comprising the same as active ingredient

    WO2002062770A1

  • Pyrazole derivatives and process for the production thereof

    WO2004013106A1

  • Process for producing 5-hydroxy-4-thiomethylpyrazole compound

    WO2005095352A1