Process to prepare 3-methyl-2-nitrobenzoic acid by air oxidation
US9828328B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | May 29, 2015 |
| Grant date | Nov 28, 2017 |
| Priority date | — |
| Expiry date | May 29, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C253/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for preparing 3-methyl-2-nitrobenzoic acid is disclosed wherein 1,3-dimethyl-2-nitrobenzene is combined with an oxidation catalyst in the presence of an oxygen source and an initiator, provided that less than 99% of the 1,3-dimethyl-2-nitrobenzene is oxidized.A method for preparing compounds of Formula 7 and Formula 11 is also disclosed wherein the method is characterized by using 3-methyl-2-nitrobenzoic acid as prepared by the method disclosed above.wherein R1 is C1-C7 alkyl, C3-C6 cycloalkyl or C4-C7 alkylcycloalkyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.