Preparation of sulfonamide herbicide process intermediates
US12077505B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Dec 20, 2019 |
| Grant date | Sep 3, 2024 |
| Priority date | — |
| Expiry date | May 12, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D213/70
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide, are provided. Also provided are compounds of Formula III, Formula VII, and IV, wherein R1 is a C1-C6 alkyl, X is Cl or OH, Y is halogen, OH, or OR2, and R2 is a C1-C6 alkyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.