Insect ether and producing method thereof

A production method and technology of pyriproxyfen, applied in botany equipment and methods, animal repellents, biocides, etc., can solve problems such as extinction, growth damage, and destruction of the natural ecological environment, and achieve long-lasting, ecological Small environmental impact and the effect of reducing the possibility of poisoning

Inactive Publication Date: 2003-09-03
沈志荣 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing common solution is to adopt insecticide to kill, though it can play to kill insects, it will cause the growth of some beneficial insects (such as: frogs, dragonflies, etc.) that depend on the above-mentioned harmful insects to survive. Destruction, or even extinction, will seriously damage the ecological environment of nature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, 4-hydroxydiphenyl ether: propylene oxide: 2-chloropyridine=1: 1: 1 (1: 1: 1 raw material molar ratio),

[0027] First throw in 145Kg of ethanol, then throw in 16Kg of sodium hydroxide, stir and make them completely dissolve, then throw in 73Kg of 4-hydroxydiphenyl ether, make it completely dissolve, then add 22.8Kg of propylene oxide dropwise, the dropwise addition is completed, at 20 React at ~35°C, add water after 16 hours, and filter to obtain 85-90Kg of the first step product 1-(4-diphenyl ether)-2-methyl isopropanol.

[0028] In the second step, first put 280Kg of toluene and the product of the first step of the previous step reaction and raise the temperature to 55-60°C to completely dissolve it, then add 87Kg of potassium hydroxide, keep it between 60-70°C to completely dissolve the potassium hydroxide, and then Slowly add 44.5Kg of 2-chloropyridine dropwise, then raise the temperature to 100-110°C, keep warm for 16 hours, evaporate the solvent to o...

Embodiment 2

[0029] Embodiment 2,4-hydroxydiphenyl ether: propylene oxide: 2-chloropyridine=1: 1.5: 1.2 (1: 1.5: 1.2 raw material molar ratio),

[0030] First put in ethanol and sodium hydroxide with the same amount, then put in 73Kg of 4-hydroxydiphenyl ether and 34.2Kg of propylene oxide after complete dissolution, and keep other conditions constant to obtain 88-90Kg of the first step product.

[0031] In the second step, 280Kg of toluene is put in to react with the first step product obtained in the previous step, 53.4Kg of 2-chloropyridine is added dropwise, and other conditions remain unchanged, 53Kg of pyriproxyfen crude product is obtained, 50Kg is obtained after recrystallization, and 48Kg mosquito fly is obtained after drying Ether products.

Embodiment 3

[0032] Embodiment 3,4-hydroxydiphenyl ether: propylene oxide: 2-chloropyridine=1: 1.98: 1.31 (1: 1.98: 1.31 raw material molar ratio),

[0033] Other conditions are all the same, the first step 4-hydroxydiphenyl ether 73Kg, propylene oxide 46Kg, get the first step product 85-90Kg; The second step first drops into toluene 300Kg and last step first step product reaction, other conditions are not Change, add potassium hydroxide to be 90Kg, 2-chloropyridine 58.3Kg, obtain pyriproxyfen crude product 55Kg after completion of the reaction, obtain 53Kg after recrystallization, obtain 50Kg pyriproxyfen finished product after drying.

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PUM

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Abstract

A pyriproxyfen as insecticide is prepared from 4-hydroxydiphenyl ether, epoxy propane and 2-chloropyridine through dissolving 4-hydroxydiphenyl ether in alcohol, reacting on expoxy propane at 0-90 deg.C for 2-24 hr under existance of sodium hydroxide to obtain the intermediate, dissolving it in toluene, heating to 30-80 deg.C, slowly dropping 2-chloropyridine in it while reacting at 10-110 deg.C for 2-24 hr under existance of botassium hydroxide, distilling to remove toluene and refining.

Description

technical field [0001] The invention relates to an insecticide and a preparation method thereof, in particular to a pyriproxyfen and a preparation method thereof. Background technique [0002] At present, in terms of the environment and the growth of crops, it is necessary to solve the harm problems of harmful insects such as flies, mosquitoes, Homoptera, Diptera, and Lepidoptera. Existing common solution is to adopt insecticide to kill, though it can play to kill insects, it will cause the growth of some beneficial insects (such as: frogs, dragonflies, etc.) that depend on the above-mentioned harmful insects to survive. Destruction, or even extinction, will seriously damage the ecological environment of nature. Contents of the invention [0003] The object of the present invention is to solve the above problems, and propose a pyriproxyfen and its preparation method which are safe to crops, low in toxicity to fish, and have little impact on the ecological environment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/40
Inventor 沈志荣陆宪辉
Owner 沈志荣
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