Preparation of sulfonamide herbicide process intermediates
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United States of America Patent
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Jul 19, 2022
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Feb 10, 2022
app pub date -
Dec 20, 2019
filing date -
Dec 27, 2018
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Abstract
Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide are provided. Specifically, these precursors are compounds of Formulas VII and/or VIII, and IX, wherein R is a C1-C6 alkyl, R1 is a C1-C6 alkyl, X is Cl or OH, Y is halogen, OH, or OR2, and R2 is a C1-C6 alkyl.
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