我们报道了受挫的路易斯对(FLP)催化的一系列脂族多氟化碳具有同等的双链和双链CF位置的单选择性CF活化。该方法可以应用于芳族,醚,硫醚和烷基支持的氟甲基。我们扩大了与单选择性C–F激活一起使用的FLP基础合作伙伴的范围,以包括硫化物。随后可以通过S N 2取代,光氧化还原烷基化和Suzuki偶联将活化的产物官能化。
Conversion of the carbonyl group to CF2 using iodine monofluoride (IF)
摘要:
A novel method for the transformation of CO --> CF2 is described. The easily made hydrazone derivatives of the carbonyl moiety are reacted under mild conditions with IF prepared directly from the corresponding elements. Various hydrazones have been examined and compared with each other. Unsubstituted ones are usually the most suitable although they are not always easy to purify and store. N-Methyl- and N,N-dimethylhydrazones also give quite satisfactory results. The more easily made dinitrophenyl hydrazones (DNPs), semicarbazones, and tosylhydrazones also react, but the yields of the desired CF2 compounds are usually lower. Oximes could also be successfully reacted. The two main byproducts of the reaction are the parent carbonyl compounds, which can be recycled, and the alpha-iododifluoro derivatives. The latter upon treatment with LiAlH4 or Bu3SnH were reduced to the desired product, thus increasing the overall yields.
Malonicacid derivatives have been successfully applied in a Ag-catalyzed decarboxylative fluorination reaction, providing an unprecedented route to either gem-difluoroalkanes or α-fluorocarboxylic acids by the judicious selection of base and solvent. This reaction features the use of readily available starting materials, tunable chemoselectivity and good functional group compatibility as well as gram-scale
Geminal difluorination of α,α’- disubstituted styrenes using fluoro-benziodoxole reagent. Migration aptitude of the α-substituents
作者:Nadia O. Ilchenko、Kálmán J. Szabó
DOI:10.1016/j.jfluchem.2017.07.006
日期:2017.11
α,α’-Disubstituted styrenes undergo a difluorination-rearrangement reaction with fluoro-benzoiodoxole reagent 1. The reaction is catalyzed by Pd(MeCN)4(BF4)2 and Cu(MeCN)4PF6. We have studied the rearrangement of α,α’-diaryl substitutedstyrenes, in which the aryl groups have different electronic character. In the case of α-aryl, α’-alkyl substitutedstyrenes, the aryl substituent has a higher migratory
Deoxyfluorination of Ketones with Sulfur Tetrafluoride (SF4) and Dialkylamines in Continuous Flow Mode
作者:Dominik Polterauer、Simon Wagschal、Michael Bersier、Clara Bovino、Dominique M. Roberge、Christopher A. Hone、C. Oliver Kappe
DOI:10.1021/acs.oprd.4c00180
日期:2024.7.19
Fluorinated molecules are prevalent in biologically active substances, in particular, the gem-difluoro motif. However, the selective incorporation of a gem-difluoro motif into organic molecules is a laborious task. Deoxyfluorination is a promising and widely used methodology to achieve this transformation, which is usually costly or highly hazardous. Herein, we report a deoxyfluorination protocol using
FLUORINE-BASED COMPOUND FOR BRANCHER, POLYMER USING SAME, AND POLYMER ELECTROLYTE MEMBRANE USING SAME
申请人:LG CHEM, LTD.
公开号:US20170226054A1
公开(公告)日:2017-08-10
The present specification relates to a fluorine-based compound for a brancher, a polymer using the same, a polymer electrolyte membrane using the same, a fuel cell using the same, and a redox flow battery including the same.