2,4-Diamino-6-halo-5-trifluoromethylpyrimidines having herbicidal activity
US4507146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Dec 19, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D239/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2,4-Diamino-6-halo-5-trifluoromethylpyrimidines of the formula ##STR1## wherein X is a halogen atom, especially chlorine or fluorine, and R.sub.1 and R.sub.2 independently of one another are each hydrogen, C.sub.1 -C.sub.6 -alkyl or C.sub.3 -C.sub.6 -cycloalkyl, or together form a C.sub.3 -C.sub.7 -alkylene bridge, have outstanding selective-herbicidal properties, and are suitable for controlling weeds in crops of cultivated plants, such as maize, cereal or soya-bean. They are produced by aminating 2,4,6-trihalo-5-trifluoromethylpyrimidine, which for its part is obtainable by fluorination of 2,4,6-trihalopyrimidine-5-carboxylic acid. The 2,4,6-trihalo-5-carboxylic acids are novel intermediates, and are obtained by oxidizing 2,4,6-trihalo-2-methyl-, -halomethyl- or -formyl-pyrimidine in sulfuric acid by means of chromium trioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.