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Chlorine-fipronil, prepartion and application

A technology for chlorofipronil and fipronil, which is applied in the field of chlorofipronil and its preparation, can solve the problems of high production cost, phytotoxicity and high toxicity, and achieves the effects of low production cost, reduced toxicity and simple process.

Inactive Publication Date: 2007-02-21
广东立威化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this variety also has two main disadvantages: (1) the production cost is relatively high; (2) it is especially highly toxic to aquatic animals such as fish and shrimp, and it is easy to cause phytotoxicity to aquatic animals such as fish and shrimp. , which limits the application and development of fipronil to a certain extent

Method used

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  • Chlorine-fipronil, prepartion and application
  • Chlorine-fipronil, prepartion and application
  • Chlorine-fipronil, prepartion and application

Examples

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Embodiment Construction

[0024] Put 100 grams of fipronil with a content of 95% into a 500ml three-neck flask, add 400ml of chloral with a content of 96%, start stirring, slowly raise the temperature to reflux temperature of 98°C, continue stirring for 36 hours, and then cool down to 0°C, crystallized for 48 hours, filtered and dried to obtain 107 grams of chlorfipronil solid, the product was a mixture, wherein (I) compound 92%, (II) compound 4%, the total content ≥ 96%, and then filtered The mother liquor is evaporated to remove chloral, and dried to obtain 25 grams of chlorofipronil solid again. The product is a mixture containing 86% of (I) compound and 6% of (II) compound. The total content is more than or equal to 92%, and the molecular yield is greater than 98%.

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Abstract

This invention relates to a method for preparing chlorofipronil and its application in pesticides. Low-toxicity chlorofipronil is prepared by addition reaction between fipronil and chloral. The new compound retains the pesticidal activity and pesticidal spectrum of fipronil, while has reduced toxicity to fishes and shrimps. The method has such advantages as simple process and low cost.

Description

technical field [0001] The present invention relates to a kind of chlorfipronil and its preparation and application, especially to a kind of original fipronil pesticide which undergoes addition reaction with chloral to form a new pesticide with low toxicity to fish, shrimp and other aquatic animals. of pesticides. Background technique [0002] Fipronil was developed by the French company Rhone-Planck, and many companies are currently producing a broad-spectrum insecticide containing flurazoles, also known as fipronil, and its chemical name: 5-amino-3 -Cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylsulfinylpyrazole, structural formula: [0003] [0004] Relative molecular weight 437.2 [0005] Fipronil has high activity and a wide range of applications. It shows extremely high sensitivity to pests such as Hemiptera, Thysanoptera, Coleoptera, and Lepidoptera, as well as pests that have developed resistance to pyrethroid and carbamate...

Claims

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Application Information

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IPC IPC(8): C07D231/44A01N47/40
Inventor 李坚
Owner 广东立威化工有限公司