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Optimization process of metamifop intermediate product

A technology of oxacloplam and products, which is applied in the field of optimization process of oxaculfamide intermediate products, can solve the problems of cumbersome reaction process, reduced overall yield of dichlorides, etc., and achieves shortening reaction process, reducing loss, The effect of increasing conversion rates

Inactive Publication Date: 2020-09-11
宁夏蓝田农业开发有限公司
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Problems solved by technology

[0005] The application provides an optimized process for the intermediate product of fenpyramid, adopting the optimized production process, by shortening the reaction process, can effectively improve the yield of producing monochloride to dichloride, to solve the traditional process due to The reaction process is relatively cumbersome, which reduces the overall yield of dichlorides

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  • Optimization process of metamifop intermediate product
  • Optimization process of metamifop intermediate product
  • Optimization process of metamifop intermediate product

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experiment example

[0055] Raw materials:

[0056] Monochloride: active ingredient content 98%, moisture 0.17%

[0057] Phosphorus pentachloride: active ingredient content 99%

[0058] Polyphosphoric acid: active ingredient content 84%

[0059] Toluene: active ingredient content 99%, moisture 0.11%

[0060] Liquid caustic soda: the concentration is 30%.

[0061] Feeding ratio:

[0062] monochloride Phosphorus pentachloride polyphosphoric acid toluene Liquid caustic soda 80g 134.4g 8g 550ml 410ml

[0063] in conclusion

[0064] Number of experiments Reflux reaction time Product content product yield Remark Experiment No. 1 3h 93％ 63％ Feeding monochloride 81.0g Experiment No. 2 3.5h 93.1％ 65％ Feeding monochloride 80.5g Experiment No. 3 4h 93.4％ 76％ Feeding monochloride 80.3g Experiment No. 4 4h 94.2％ 79％ Feeding monochloride 81.5g

[0065] Visible, adopt the dichloride preparation method that provides i...

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Abstract

The invention provides an optimization process of a metamifop intermediate product, 2,6-dichlorobenzoxazole. The optimization process comprises the following steps: directly reacting 6-chlorobenzoxazolone, polyphosphoric acid and phosphorus pentachloride at a high temperature to generate 2,6-dichlorobenzoxazole. Comparing with conventional preparation of the 2,6-dichlorobenzoxazole, according to the method, the optimized production process is adopted, and the reaction process is shortened, so that the yield of monochloro compounds to dichlorocompounds can be effectively increased, the loss ofintermediate reaction is greatly reduced; meanwhile, the conversion rate is increased, and the problem that the overall yield of dichlorocompounds is reduced due to the fact that the reaction processis complex in the traditional process is solved.

Description

technical field [0001] The present application relates to the technical field of preparation of fenpyramid herbicides, in particular to an optimization process of a fenpyralid intermediate product. Background technique [0002] Metamifop (Metamifop) is an aryloxyphenoxypropionate herbicide developed by Korea Chemical Technology Research Institute, which can control most annual grass weeds very well, unlike most of these herbicides Yes, fenpyramid is safe for rice, and can effectively control the main weeds in rice fields, such as barnyardgrass, stephenia, crabgrass and goosegrass, and is mainly used for weeding in transplanted and direct seeded rice fields. Mefenpyramid has low toxicity, is environmentally safe, has wide compatibility, and is expected to be used for weeding other crops and lawns. It is a promising herbicide. Methafen is a new type, high efficiency, low toxicity, environment-friendly aryloxyphenoxypropionate herbicide, which belongs to aryloxyphenoxypropiona...

Claims

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Application Information

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IPC IPC(8): C07D263/58
CPCC07D263/58
Inventor 王龙张海松郭超王林梁院龙赵乐
Owner 宁夏蓝田农业开发有限公司
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