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Carbaminate herbicide

A technology of carbamates and herbicides, which is applied in the direction of herbicides, algicides, biocides, biocides, etc., and can solve the problems that affect the wide application, the efficacy of sulfonate is not outstanding, and the activity is low.

Inactive Publication Date: 2007-01-24
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the 1980s, with the advent of the era of high-efficiency herbicides, the efficacy of sulfonate was not prominent, its activity was low, and its dosage was large, which affected its wide application.

Method used

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  • Carbaminate herbicide
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Synthesis of methyl 4-(2-methyl-4-chloro-phenoxyacetylamino)benzenesulfonylcarbamate

[0017] 1.1 The present invention is implemented with reference to the following synthetic route

[0018]

[0019] Add 500ml of carbon tetrachloride to a 1000ml three-necked flask, add 80.0g (0.4 moles) of 2-methyl-4-chloro-phenoxyacetic acid, heat up to 40±2°C, and then dropwise add 53.6g (0.45 moles) Thionyl chloride, after dripping, heat up to 60±2°C, and react for 4 hours; add 92.0 g (0.4 moles) of methyl p-aminobenzenesulfonyl carbamate, and react at 75±2°C for 4 hours; Carbon chloride, then add 150ml methanol, stir at room temperature for 10-30 minutes to precipitate a white solid, filter and dry to obtain 143g 4-(2-methyl-4-chloro-phenoxyacetylamino)benzenesulfonylcarbamate ester.

[0020] 1.2 Structural Identification

[0021] Melting point:

[0022] 184~186℃

[0023] Elemental analysis:

[0024] Found C% 49.50 H% 4.16 N% 6.83

[0025] Theoretical C% 49.46 H...

Embodiment 24

[0031] Example 24-(2,4-dichlorophenoxyacetamido) methyl benzenesulfonylcarbamate synthesis

[0032] 2.1 The present invention is implemented with reference to the following synthetic route:

[0033]

[0034] Add 500ml of chloroform to a 1000ml three-necked flask, add 121.6g (0.55 moles) of 2,4-dichlorophenoxyacetic acid, heat up to 60±2°C, add 60.0ml (0.55 moles) of thionyl chloride dropwise, and drop After heat preservation reaction for 1 hour, then add 126.2 g (0.5 moles) of methyl p-aminobenzenesulfonylcarbamate and heat up to 60±2°C. After heat preservation reaction for 3 hours; remove chloroform under reduced pressure, add 150 ml of absolute ethanol, and Stir for 10-30 minutes to precipitate a white solid, filter and dry to obtain 182 g of methyl 4-(2,4-dichlorophenoxyacetylamino)benzenesulfonylcarbamate.

[0035] 2.2 Structure identification

[0036] Melting point: 188℃~190℃

[0037] Elemental analysis:

[0038] Found C% 42.93 H% 3.21 N% 6.47

[0039] Theoretical...

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Abstract

The present invention is carbaminate herbicide, and belongs to the field of farm chemical technology. In order to raise the herbicidal effect and activity of asulam herbicide, the present invention alters and optimizes the structure of asulam compound as precursor compound to obtain the new herbicide. The present invention is used main for farm field, orchard, tea garden, wood land, etc to prevent and kill most of monocotylous and dicotylous weeds, such as fixweed, Indian mallow, speedwell, etc.

Description

technical field [0001] The invention is a carbamate herbicide, which belongs to pesticides and is mainly used for removing weeds. Background technique [0002] The development of pesticides is developing in the direction of high efficiency, safety, economy, and pollution-free. Some pesticides with high toxicity, high residue, and serious environmental pollution have been eliminated one after another, while those that are environmentally friendly, ultra-efficient, high-selective, and low-priced New varieties of pesticides are favored by people. At present, the main sign of the development of pesticides in the world is to emphasize high activity while paying more attention to safety to ensure the safety of non-target organisms, humans and the environment, and there is a trend of safety first and activity second, and the development of herbicides is no exception. The mechanism of action of herbicides is mainly to inhibit and block the normal physiological process of plants, le...

Claims

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Application Information

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IPC IPC(8): A01N47/10A01P13/00
Inventor 丁秀丽王列平鲁鸣久宁斌科薛超李宗英刘康云邱甬生
Owner XIAN MODERN CHEM RES INST
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