200509-41-7Relevant academic research and scientific papers
A method of synthesizing high-quality kuikui standing grain rice polishings ester
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Paragraph 0026; 0027; 0028; 0029, (2017/08/26)
The invention discloses a synthesis method for high-quality quizalofop-P-tefuryl. The synthesis method comprises the following step: carrying out reaction between (R)-2-[4(6-chloro-2-quinoxalinyl)phenoxyl]ethyl propionate and tetrahydrofurfuryl alcohol under the action of catalyst dibutyltin oxide at the temperature of 90-180 DEG C. By using the method disclosed by the invention, the high-quality quizalofop-P-tefuryl with the content of more than 97% and the optical effective body of more than 97% can be directly obtained without complicated post-treatment, and the reaction yield can reach more than 97%.
Preparation method of quizalofop-p-tefuryl
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Paragraph 0052; 0053; 0054; 0055, (2016/11/21)
The invention provides a preparation method of quizalofop-p-tefuryl. The preparation method comprises the following steps: in the presence of a titanate catalyst, reacting ethyl (R)-2-[4-(6-chloroquinoxalinyl-2-oxy)phenoxy]propionate and tetrahydrofurfuryl alcohol in a nonpolar organic solvent, and carrying out low-temperature refrigeration treatment to obtain the quizalofop-p-tefuryl. Compared with the prior art, the reaction system after reaction is subjected to low-temperature refrigeration treatment to remove inorganic impurities in the organic phase, thereby enhancing the content and appearance of the product; and thus, both the optical content and chemical content of the quizalofop-p-tefuryl are enhanced. The whole method has the advantages of simple production technique, lower equipment cost and no harmful effects on the environment, and is suitable for large-scale industrial production.
