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Method for synthesizing propoxur

A synthetic method, the technology of propoxur, which is applied in the field of pesticide synthesis, can solve the problems of complicated process and serious environmental pollution

Inactive Publication Date: 2011-05-18
李家波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Chloroformic acid ester method, the method flow process is more complicated;
[0005] 2. carbamoyl chloride method, this method is more serious to environmental pollution;

Method used

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  • Method for synthesizing propoxur
  • Method for synthesizing propoxur
  • Method for synthesizing propoxur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The method step of the present invention is: in glass reactor, add o-isopropoxyphenol and catalyzer, n (phenol): n (catalyst)=1: 0.001~0.05; Stir and cool, slowly add methyl isocyanate ( MIC), n(phenol):n(MIC)=1:1~1:1.2; after the dropwise addition, react at 60~110°C for 0.5~3h.

[0015] The reaction equation is:

[0016]

[0017] As a preferred solution, the present invention adopts the following technical solution, n(phenol):n(catalyst):n(MIC)=1:0.005:1.05; the reaction temperature is 90-100°C, and the reaction time is 2h.

[0018] The present invention selects raw material molar ratio, catalyst consumption, reaction temperature, reaction time as the factor affecting reaction yield, see Table 1, Table 2, Table 3, Table 4.

[0019] The influence of table 1 raw material mol ratio on reaction yield

[0020] serial number

n(phenol):n(MIC)

content / %

Yield / %

1

1∶1

96.8

98.8

2

1∶1.05

97.4

99.1

3...

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PUM

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Abstract

The invention relates to a method for synthesizing a pesticide, in particular to a method for synthesizing propoxur. The invention provides the method for synthesizing the propoxur, which is simple and has low pollution and high yield. The method comprises the following steps of: adding o-isopropoxy phenol and catalyst in a ratio of 1:0.001-0.05 into a glass reactor; stirring and cooling, and slowly dripping methylisocyanate (MIC), wherein the ratio of the phenol to the MIC is 1:1-1:1.2; and after the dripping is completed, reacting for 0.5 to 3 hours at the temperature of between 60 and 110 DEG C.

Description

Technical field: [0001] The present invention relates to a kind of synthesis method of insecticide, more specifically, relates to the synthesis method of propoxur. Background technique: [0002] Proxacarb is a carbamate insecticide, which is mainly used for the control of economic crop pests and the elimination of various sanitary pests in households and public places. It has the characteristics of wide insecticidal spectrum, long residual effect and high insecticidal rate. [0003] At this stage, there are three synthesis methods of propoxur: [0004] 1. Chloroformic acid ester method, the method flow process is more complicated; [0005] 2. carbamoyl chloride method, this method is more serious to environmental pollution; [0006] 3. The methyl isocyanate method, although the method has simple process flow and few wastes, the reaction yield is generally below 90%. Invention content: [0007] The present invention aims at the above problems and provides a method for sy...

Claims

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Application Information

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IPC IPC(8): C07C271/44C07C269/02
Inventor 李家波
Owner 李家波
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