| abstract |
The derivatives are represented by general formula (1) wherein R 1 , R 2 , and R 3 each independently represents hydrogen, halogen, nitro, alkyl, alkoxy, alkenyloxy, alkynyloxy or cycloalkyloxy; R 4 and R 5 each independently represents hydrogen, alkyl, aryl or, when taken together, R 4 and R 5 form a polymethylene chain; with the above-described alkyl, alkoxy, alkenyloxy, alkynyloxy, cycloalkyloxy, and aryl being optionally substituted. The novel derivatives show an excellent herbicidal activity against harmful weed with low phytotoxicity for crop plants. |