- NOVEL CRYSTALLINE FORM OF TEFLUTHRIN, PROCESS FOR ITS PREPARATION AND USE THEREOF
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Provided are the crystalline form of tefluthrin of formula (I), the crystal preparation process, the analyses of the crystal through various analytical methods and using the crystal to prepare stable agrochemical formulation. Also provided is the use of various solvents towards the crystalline form preparation conditions.
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Paragraph 0071-0072
(2019/01/05)
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- Mg-Prompted Polyfluoroarene C-H Functionalization: Formal Synthesis of Transfluthrin, Fenfluthrin, and Tefluthrin
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Directing group and transition metal free C-H bond functionalization of a simple molecule is an ideal but challenging chemical transformation. Herein, we report a general Mg-prompted approach to synthesize versatile polyfluoroaryl carbinols at ambient temperature via polyfluoroarene C-H bond addition to aldehydes, which featured excellent monoaddition selectivity and broad functional group compatibility. The usefulness of this practical and efficient method was demonstrated in gram-scale formal synthesis of pyrethroid insecticides transfluthrin, tefluthrin, and fenfluthrin.
- Jia, Xuejiao,Wang, Junya,Ding, Xue,Yang, Jun,Li, Nan,Zhao, Na,Huang, Zhiyan
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p. 10874 - 10882
(2015/11/18)
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- PRODUCTION PROCESS OF NUCLEUS-HALOGENATED METHYLBENZYL ALCOHOL
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The present invention provides an industrially advantageous process for preparing nuclear halogenated methylbenzyl alcohol which is a useful substance as a raw material, an intermediate for manufacturing medicines, agricultural chemicals, etc. The process of the present invention for preparing nucleus-halogenated methylbenzyl alcohol represented by the following formula (II) comprises hydrogenating nucleus-halogenated benzene carbaldehyde represented by the following formula (I); wherein m is an integer of 0 to 3, and n is an integer of 1 to 4, with the proviso that m+n is an integer of 1 to 4, wherein m and n are the same as those in the formula (I).
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Page/Page column 5
(2010/06/19)
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- A new synthetic route to polyfluorobenzyl alcohol
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The synthesis of polyfluorinated benzyl alcohol from pentafluorobenzoic acid has been developed. An economical and effective direct reduction method of polyfluorobenzoic acid by zinc borohydride is described.
- Zhang, Deyan,Chen, Zizhan,Cai, Huihua,Zou, Xinzhuo
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experimental part
p. 938 - 941
(2010/01/15)
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- METHOD FOR PRODUCING 4-METHYL-2,3,5,6-TETRAFLUOROBENZYL ALCOHOL
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A process for producing 4-methyl-2,3,5,6-tetrafluorobenzyl alcohol comprising the following steps (A) to (D): Step (A): a step for fluorinating 2,3,5,6-tetrachloroterephthaloyl dichloride, Step (B): a step for reducing the product obtained in step (A), Step (C): a step for chlorinating the product obtained in step (B), Step (D): a step for hydrogenating the product obtained in step (C).
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Page/Page column 13
(2009/12/07)
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- Preparation of one intermediate for pyrethroids
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Methods for preparing 2,3,5,6-tetrafluorodimethylolbenzene, an intermediate for the preparation of pyrethroids, are disclosed. A method for preparing 2,3,5,6-tetrafluorodimethylolbenzene includes the reduction of tetrafluoroterephthalate. Various reduction processes are disclosed, which are simple and safe and can afford the product in high yield and purity. Processes for preparing tefluthrin from 2,3,5,6-tetrafluorodimethylolbenzene, by halogenation, hydrogenation, and esterification, are also disclosed.
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Page/Page column 4
(2008/06/13)
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- Process for producing fluorinated methyl-benzyl alcohol
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An object of the present invention is to provide a process for producing a fluorinated methyl-benzyl alcohol, which process is industrially practicable. A process for producing a fluorinated methyl-benzyl alcohol according to the present invention comprises hydrogenolysis of one hydroxyl group in fluorinated benzene dimethanol.
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- Process for producing cyclopropanecarboxylates
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There is disclosed a process process for producing a cyclopropanecarboxylate of formula (1): 1which process comprises reacting cyclopropanecarboxylic acid of formula (2): 2with a monohydroxy compound of formula (3): R6OH??(3),in the presence of a catalyst compound comprising an element of to Group 4 of the Periodic Table of Elements.
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- Pyrimidine substituted-2,2-dimethylcyclopropane carboxylates useful for combating insect and acarine pests at a locus
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A compound of formula: STR1 wherein R2 represents an α-branched alkyl group containing from 3 to 6 carbon atoms, and R represents either (a) hydroxy, halo or alkoxy of up to six carbon atoms, or (b) the group --OR1 where R1 is the residue of an alcohol of formula R1 OH which forms an insecticidal ester with chrysanthemic acid, permethrin acid or cyhalothrin acid. The compounds have insecticidal and acaricidal properties.
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