Preparation method of N-(4-ethoxycarbonylphenyl)-N'-ethyl-N'-phenylformamidine

Abstract

The invention relates to a preparation method of N-(4-ethoxycarbonylphenyl)-N'-ethyl-N'-phenylformamidine, comprising the following steps of: simultaneously adding raw materials which are para-amino ethyl benzoate, tri-alkyl ortho-formate and N-ethylphenylamine into a reaction kettle, mixing and performing one-step condensation in the reaction kettle at 80 to 160 DEG C; distilling a reaction liquid under reduced pressure to produce a distilled product of the N-(4-ethoxycarbonylphenyl)-N'-ethyl- N'-phenylformamidine and then refining with alcohol to produce a finished product of the N-(4-ethoxycarbonylphenyl)-N'-ethyl- N'-phenylformamidine. The method lowers the reaction temperature, reduces the reaction step, improves the purity of product, reduces the pollution and equipment investment, saves labor and reduces energy consumption and labor intensity, has good product color, high content, low cost and simple operation, and is easy to realize large-scale industrial production.

Description

Technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a preparation method of N-(4-ethoxycarbonylphenyl)-N'-ethyl-N'-phenylformamidine. Background technique [0002] N-(4-ethoxycarbonylphenyl)-N'-ethyl-N'-phenylformamidine is an efficient anti-ultraviolet additive, which can absorb ultraviolet light in the 240-300nm band, almost completely absorbing 300~ Ultraviolet rays in the 330nm band. Adding this absorbent in the production process of various organic materials such as plastic products, resin products, dyes, and textiles can reduce and avoid damage to the physical properties of the above-mentioned products due to the photodegradation of ultraviolet rays (such as product discoloration, decolorization or easy brittle, brittle). And compared with the UV absorbers of benzophenones or benzotriazoles, the UV resistance of N-(4-ethoxycarbonylphenyl)-N'-ethyl-N'-phenylformamidine More superior, better stability than N-(4-ethox...

AI Technical Summary

Problems solved by technology

The disadvantage of this synthetic method is that the reaction process will be carried out at about 230°C at a higher temperature, and the intermediate will be taken out, and the high temperature reaction will cause the product N-(4-ethoxycarbonylphenyl)-N The color and purity of '-ethyl-N'-phenylformamidine are affected, and large-scale industrial production is limited

[0005] 2) Use N-phenyl-N-ethylformamide and ethyl p-aminobenzoate to synthesize N-(4-ethoxycarbonylphenyl)-N'-ethyl under the action of reagents such as phosphorus oxychloride -N'-phenylformamidine, for example: the scheme described in the patent US5243055; although this synthesis method simplifies the process to one-step synthesis, the phosphorus oxychloride it uses is highly corrosive, the production environment is poor, and the amount of sewage is large. And separation and purification are more loaded down with trivial details, thereby also limited the industrial application of this method

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