CAS: 141573-95-7; Ethyl 3-(Difluoromethyl)-1-Methyl-1H-Pyrazole-4-Carboxylate

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Ethyl 4,4-Difluoro-2-[1-{n-Methyl-N'-[1-Phenylmethylidene]Hydrazino}-Methylidene]-3-Oxobutyrate置于对甲苯磺酸体系中,用 乙醇 用作溶剂,化学反应 16.0H,反应生成3-二氟甲基-1-甲基吡唑-4-甲酸乙酯
参考文献:Method For Preparing 1,3,4-Substituted Pyrazol Compounds
标题:Method For Preparing 1,3,4-Substituted Pyrazol Compounds
摘要:该发明提供了一种以太网桥或路由器,包括一个网络结构,适用于为多个以太网端口提供互连性,每个以太网端口适用于接收和/或传输以太网帧,以及该以太网桥或路由器进一步包括一个封装器,连接到以太网端口以接收以太网协议数据单元,其中该封装器能够从接收到的以太网协议数据单元生成一个面向网络结构的协议数据单元,该面向网络结构的协议数据单元包括一个头部部分和一个负载部分,该负载部分包括所涉及的以太网协议数据单元,该封装器能够将以太网协议数据单元中的目的地址信息转换为网络结构的路由定义,并将该路由定义包含在面向网络结构的协议数据单元的头部部分中.还提供了一种通过网络进行数据传递的方法.

专利信息

专利号:US-2022372000-A1
优先权日:2021-05-05
标 题:New Process for the Synthesis of 5-Fluoro-3-(Difuoromethyl)-5-Fluoro-1-Methyl-1H-Pyrazole-4-Carboxylic Acid Derivatives and the Free Acid Thereof
发明人：LUO WEIFEN; WU WENTING
权利人:FUJIAN YONGJING TECH CO LTD
摘要:The invention provides a new process for the synthesis of 5-fluoro-3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid derivatives and the free acid thereof, involving a direct fluorination reaction with a fluorination gas comprising or consisting of elemental fluorine (F2), in a reactor which is resistant to elemental fluorine (F2) and hydrogen fluoride (HF), and wherein in the process as a starting material a difluoromethyl-pyrazole compound dissolved in an inert solvent is subjected to the direct fluorination reaction. Some particular examples of 5-fluoro-3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid derivatives which can be prepared according to the process of the invention are 3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid fluoride (5F-DFMPAF), also known under the alternative name 3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carbonyl fluoride; 3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid ethylester (5F-DFMP); and 3-(chlorodifluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid ethylester (5F-CDFMP), or the corresponding methyl esters. The 5-fluoro-3-(difluoromethyl)-5-fluoro-1-methyl-1H-pyrazole-4-carboxylic acid can be obtained from its carboxylic acid derivatives such as, e.g., mentioned before in that the acid derivative is converted to the corresponding carboxylic acid.

专利号:US-8629288-B2
优先权日:2008-02-25
标题:Method for the regioselective synthesis of 1-alky1-3-haloalkyl-pyrazole-4-carboxylic acid derivatives
发明人：PAZENOK SERGII; LUI NORBERT; HEINRICH JENS-DIETMAR; WOLLNER THOMAS
权利人:PAZENOK SERGII; LUI NORBERT; HEINRICH JENS-DIETMAR; WOLLNER THOMAS; BAYER IP GMBH
摘要:The present invention relates to a process for the regioselective synthesis of 1-alkyl-3-halo-alkylpyrazole-4-carboxylic acid derivatives by cyclization of 2,3-disubstituted acrylic acid derivatives, and to the hydrazones formed as intermediates in the process.

专利号:WO-2015155713-A1
优先权日:2014-04-09
标题 :Process for the regioselective synthesis of 1,3, 4 -substituted pyrazoles
发明人：MEAZZA GIOVANNI; MEREGHETTI PIERANGELO; SILLANI LAURA; FORGIA DANIELE; BELLANDI PAOLO
权利人:ISAGRO SPA
摘要:A process is described for the synthesis of pyrazoles having general formula (I) comprising the following steps: a) a mixture comprising an alkyl-hydrazine having formula (II) RNH-NH 2 and a compound having general formula (III) Rx 1 -X 1 -Rx-X 2 -Rx 2 , b) the mixture obtained in step a) is reacted with a compound having formula (IV), obtaining a 1,3,4-substituted pyrazole having general formula (I), according to the reaction scheme 1.

专利号:US-8350053-B2
优先权日:2008-03-10
标 题:Process for the regioselective preparation of 1-alkyl-3-haloalkylpyrazole-4-carboxylic acid derivatives
发明人：PAZENOK SERGII; LUI NORBERT; NEEFF ARND
权利人:BAYER CROPSCIENCE AG; PAZENOK SERGII; LUI NORBERT; NEEFF ARND
摘要:The present invention relates to a process for the regioselective synthesis of 1-alkyl-3-halo-alkylpyrazole-4-carboxylic acid derivatives by cyclization of 2,3-disubstituted acrylic acid derivatives with hydrazines in the presence of carbonyl compounds.

专利号:CA-2716381-C
优先权日:2008-02-25
标 题 :Method for the regioselective synthesis of 1-alkyl-3-haloalkyl-pyroazole-4-carboxylic acid derivatives

专利号:US-8592605-B2
优先权日:2008-02-25
标 题:Method for the regioselective synthesis of 1-Alkyl-3-haloalkyl-pyrazole-4-carboxylic acid derivatives