2,4-diamino-6-halo-5-trifluoromethylpyrimidines having...

Details 2,4-diamino-6-halo-5-trifluoromethylpyrimidines having... 2,4-diamino-6-halo-5-trifluoromethylpyrimidines having...

C - Chemistry, Metallurgy

07

D

260/251, 71/7.9

C07D 239/48 (2006.01) A01N 43/54 (2006.01) C07D 239/30 (2006.01) C07D 403/04 (2006.01)

Patent

CA 1245219

Case 5-14251/ZFO/= 2,4-Diamino-6-halo-5-trifluoromethylpyrimidines having herbicidal activity Abstract 2,4-Diamino-6-halo-5-trifluoromethylpyrimidines of the formula Image (I) wherein X is a halogen atom, especially chlorine or fluorine, and R1 and R2 independently of one another are each hydrogen, C1-C6-alkyl or C3-C6-cycloalkyl, or together form a C3-C7-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 oxidising 2,4,6-trihalo-2-methyl-, -halomethyl- or -formyl-pyrimidine in sulfuric acid by means of chromium trioxide.

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