- Preparation method of triclopyr butoxyethyl ester
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The invention relates to a preparation method of triclopyr butoxyethyl ester, and belongs to the technical field of organic synthesis. The to-be-solved technical problem is that the reaction yield oftriclopyr butoxyethyl ester prepared by taking sodium trichloro pyridinol as an intermediate is slightly low, thereby causing slightly low content of the finally product in the prior art. The invention discloses the preparation method of the triclopyr butoxyethyl ester. Firstly, ethylene glycol monobutyl ether and glycolic acid are subjected to an esterification reaction to obtain glycolic acid butoxyethyl ester, then tetrachloropyridine is added for a reaction, and the triclopyr butoxyethyl ester is obtained. The preparation method of the triclopyr butoxyethyl ester has the advantages that the purity and yield of a target product are effectively improved, the raw materials are cheap and easy to obtain, the selectivity is good, side effects are few, the product yield is high, the reactionconditions are mild and easy to control, and the process is simple in operation and easy to industrialize.
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Paragraph 0051-0060
(2019/10/22)
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- Method for preparing sucrroxypyr-butoxyethyl ester by aqueous phase synthesis method (by machine translation)
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1 (2, 2 - Trichlor 3-5-pyridyloxy) methyl acetate, ethylene glycol monobutyl ether and a catalyst, are added to a flask provided with a dryer, a condenser, a thermometer and a stirrer. (6 -) to obtain methyl sucralyl-butoxyethyl ester after the reaction process . sodium chloride, methyl acetate and dimethyl formamide are added to a flask provided with a dryer, a condenser, a thermometer and a stirrer to heat up, and the reaction system is dried, filtered, washed, stirred and dried to obtain -2 - (3, 2 - 3-pyridyloxy) methyl acetate; (iv) the reaction system is subjected to a reaction treatment step:2 - (. 5 6 -) The reaction system is filtered and dried to obtain methyl chloride, ethyl acetate and tert-butyl acetate. The method, provided by the invention, is simple to operate, environmentally friendly, raw materials are tetrachloropyridine, and the cost is lower. (by machine translation)
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Paragraph 0016; 0020-0024; 0025; 0029-0039
(2019/10/01)
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- Method for preparing triclopyr 2-butoxyethyl ester
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The invention discloses a method for preparing triclopyr 2-butoxyethyl ester. The method comprises the steps of dissolving sodium trichloro pyridinol by taking dimethyl formamide (DMF) as a solvent; dropwise adding ethyl chloroacetate and a catalyst and reacting to form an intermediate ethyl triclofenoxyacetate; carrying out filtering separation on the intermediate; and by taking methylbenzene asa solvent, adding butyl cellosolve and a catalyst to form the product triclopyr 2-butoxyethyl ester. The method has the advantages that the process flow is simple, the reaction time is short and the product can be obtained by only two-step reaction; in the reaction process, the amount of waste water is small and the process is highly environmentally friendly; a by-product produced by the reactionis ethanol which is safer and more environmentally friendly than methanol; and the total product yield is high and can be up to more than 88% and the product content can be up to more than 96%.
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Paragraph 0027; 0030; 0031; 0034; 0035; 0038; 0039; 0042
(2019/01/21)
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- Preparation method of herbicide triclopyr butoxyethyl ester
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The invention discloses a preparation method of an herbicide, namely triclopyr butoxyethyl ester, belonging to the field of pesticide chemistry. The preparation method is implemented by the steps of reacting by virtue of raw materials including sodium trichloropyridinol and chloroacetic acid in the presence of a catalyst 1 and an organic solvent, so as to obtain picolinic acid type triclopyr (triklopir) as a raw material, preparing acyl chloride from triclopyr, carrying out condensation reaction by virtue of acyl chloride and 2-butoxyethanol in the presence of a catalyst 2, an acid-binding agent and an organic solvent, so as to obtain triclopyr butoxyethyl ester. The content of triclopyr butoxyethyl ester is 95.2%, and the yield is 85.6%; the synthesis is easy in operation, the post-treatment is simple and convenient, wastewater is little, and the preparation method is suitable for preparing the herbicide, namely triclopyr butoxyethyl ester.
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Paragraph 0027; 0031; 0035
(2017/11/29)
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- PREPARATION OF TRICLOPYR, ITS INTERMEDIATE AND BUTOXYETHYL ESTER
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This invention relates to process for preparation of Triclopyr, Triclopyr- butoxyethyl ester and its intermediate viz. 2-butoxyethyl chloroacetate. Triclopyr is prepared by hydrolysis of its alkyl esters. Triclopyr- butoxyethyl ester is prepared by reaction of triclopyr and 2-butoxyethanol in presence of a catalyst. Triclopyr-butoxyethyl ester is also prepared by transesterification from alkyl esters of Triclopyr. 2-butoxyethyl chloroacetate is prepared by reaction of chloroacetic acid and 2-butoxyethanol in presence of a catalyst.
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Page/Page column 24
(2010/04/06)
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