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Preparation technology of octyl triazone and tautomer thereof

A technology of tautomers and octyl triazone, which is applied in the field of preparation technology of octyl triazone and its tautomers, can solve the problems affecting the production of octyl triazone and its tautomers Product yield, product yield needs to be improved, etc.

Inactive Publication Date: 2009-09-09
孙玉明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the disclosed process for producing octyltriazone and its tautomers is mainly prepared by crystallization and separation, such as the technical scheme disclosed in Chinese patent ZL03805075.7, which describes the selection of crystallization solvents. For different solvents The selection of octyl triazone will affect the product yield of octyl triazone and its tautomers, and the product yield of existing technology still needs to be improved

Method used

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  • Preparation technology of octyl triazone and tautomer thereof
  • Preparation technology of octyl triazone and tautomer thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Cyanuric chloride and isooctyl p-aminobenzoate are refluxed in xylene or ethylbenzene for 16 hours to remove the solvent, add three times the weight of ethanol to isooctyl p-aminobenzoate, and reflux to make it completely dissolved. , add water equivalent to 15% of the weight of ethanol, cool to room temperature under vigorous stirring, and two phases begin to appear. After stirring for several hours, the material gradually solidifies and precipitates, and then centrifuged, washed with petroleum ether, and dried to obtain the target product.

Embodiment 2

[0012] After cyanuric chloride and isooctyl p-aminobenzoate were refluxed in dimethylbenzene or ethylbenzene for 16h to remove the solvent, add three times the weight of methanol and ethanol mixed solution of isooctyl p-aminobenzoate Accounting for the mixed solution weight ratio is 20%), reflux, after making it completely dissolved, add water equivalent to 15% of the mixed solution gross weight, cool to room temperature under vigorous stirring and two phases appear, and the material slowly hardens after stirring for several hours. After solidification and precipitation, the target product was obtained by centrifugation, washing with petroleum ether, and drying.

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PUM

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Abstract

The invention discloses a preparation technology of octyl triazone and a tautomer thereof. The preparation technology obtains target products by adding water into a single solvent or a mixed solvent in a solidifying way. The solidifying method is requested to be operated in a mixed solution of ethanol and water, wherein the proportion by weight of the water is 10-30 percent of the mixed solution; the solidifying method is requested to be operated in a mixed solution of methanol, ethanol and water, wherein the proportion by weight of the methanol is 5-40 percent of the mixed solution, and the proportion by weight of the water is 10-30 percent of the mixed solution. The preparation technology not only has simple operation, but also has high yield coefficient of products.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation process of octyl triazone and its tautomers. Background technique [0002] Octyl triazone is a new type of ultraviolet absorber developed in recent years. It has a large molecular structure and high ultraviolet absorption efficiency, and has a broad-spectrum sunscreen effect. It can prevent both UVB and UVA. Can be used as an additive in sunscreen products. At present, the disclosed process for producing octyltriazone and its tautomers is mainly prepared by crystallization and separation, such as the technical scheme disclosed in Chinese patent ZL03805075.7, which describes the selection of crystallization solvents. For different solvents The selection of octyl triazone will affect the product yield of octyl triazone and its tautomers, and the product yield of the existing technology still needs to be improved. Contents of the invention [0003] The object of th...

Claims

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Application Information

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IPC IPC(8): C07D251/70A61Q17/04
Inventor 孙玉明
Owner 孙玉明
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