Sulfonyl urea compounds and herbicidal activity thereof

Abstract

The invention relates to a sulfonylurea compound synthesizing method and grass-clearing active. The general formula of the compound is (I), in which R1 is 1-6 alkyl, 1-6 alkoxy, 1-6 carbonyl, halogen or nitro group; R2 is 1-6 alkyl, 1-6 alkoxy, 1-4 alkyl sulfide, 1-4 alkylamino radical, halogen or nitro group; R3 is 1-6 alkyl, 1-6 alkoxy, 1-6 alkyl substitution, 1-6 acylaminosulfonamides, 1-6 alkylamine, aryl, aryl substituent, halogen or nitro group. The invention possesses elite grass-clearing active and selective to crop, and it especially can be used as weed killer to eliminate broadleaf weed in corn field.

Description

technical field

[0001] This invention relates to sulfonylurea compounds and their herbicidal activity. Background technique

[0002] Among the reported sulfonylurea compounds, most of them have strong selectivity, and their sensitivities to different crops vary greatly. Since these compounds may cause serious harm to the next crops, some sulfonylurea compounds are used as Active ingredient herbicides (such as chlorsulfuron) have been restricted in some areas.

[0003] European patent EP502740 discloses the compound of following formula:

[0004]

[0005] The sulfonylurea compound substituted at the 5-position of the aromatic ring not only has high activity, but also has a fast degradation rate, and has little or no influence on subsequent crops.

[0006] Because the cultivation system of crops in our country is different from that in foreign countries, the main crops in developed countries are only planted once a year, while in our country we have to plant multiple crop...

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