Twenty-six derivatives of pyrazole-5-sulfonylurea.s were synthesized and investigated for their herbicidal activities.The title compound, pyrazosulfuron-ethyl (5, code No. NC-311), was found the best compound that was highly effective in controlling paddy weeds, especially annual and perennial broad-leaf weeds and sedges. In the paddy-field trial, 5 effectively controlled weeds at the rate of 20-30 g a.i. /ha without phytotoxicity to transplanted rice. This herbicide is proposed as a potent novel herbicide to protect paddy rice.
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