α-Monofluoroalkanoic acids are important intermediates in the synthesis of biologically active fluorine compounds. General methods of preparation have been examined, based on the three following reagents: (a) hydrogen fluoride + N-bromoacetamide; (b) diethyl monofluoromalonate; and (c) perchlorylfluoride. The first of these is the recommended procedure for simple unsubstituted α-fluoro acids; however, the
Preparation of 2-fluoromalonic esters and related compounds from hexafluoropropene
作者:Nobuo Ishikawa、Akio Takaoka、M.Kamal Ibrahim
DOI:10.1016/s0022-1139(00)80949-5
日期:1984.6
Dimethyl and diethyl fluoromalonates were prepared from hexafluoropropene by its exhaustive alcoholysis or alternatively its ammonolysis and alcoholysis. Fluoromalonates thus obtained or their alkylated derivatives were condensed with o-phenylenediamine or its substituted derivatives to give a number of 1H-3-fluoro-1,5-dibenzodiazepin-2,4(3H,5H)-diones.
氟丙二酸二甲酯和二乙酯是通过六氟丙烯的彻底醇解或交替进行氨解和醇解而制得的。将如此获得的氟马来酸酯或其烷基化衍生物与邻苯二胺或其取代的衍生物缩合,得到许多1 H -3-氟-1,5-二苯并二氮杂-2,4(3 H,5 H)-二酮。
A Unified and Desymmetric Approach to Chiral Tertiary Alkyl Halides
can reductively desymmetrize a large collection of easily available halomalonic esters to α-halo-β-hydroxyesters. These polyfunctionalized tertiary alkyl fluorides, chlorides, and bromides proved to be useful intermediates toward fluorinated drug analogs and polyhalogenated monoterpenes. The facile intramolecularepoxidation of the chiral chloride and bromide products has also enabled expeditious access
New promising lithium malonatoborate salts for high voltage lithium ion batteries
作者:Xiao-Guang Sun、Shun Wan、Hong Yu Guang、Youxing Fang、Kimberly Shawn Reeves、Miaofang Chi、Sheng Dai
DOI:10.1039/c6ta07757a
日期:——
Three new lithiumsalts, lithium difluoro-2-methyl-2-fluoromalonatoborate (LiDFMFMB), lithium difluoro-2-ethyl-2-fluoromalonatoborate (LiDFEFMB), and lithium difluoro-2-propyl-2-fluoromalonatoborate (LiDFPFMB), have been synthesized and evaluated for application in lithium ion batteries. These new salts are soluble in a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (1 : 2 by wt)
三种新的锂盐分别是二氟-2-甲基-2-氟丙二酸硼酸锂(LiDFMFMB),二氟-2-乙基-2-氟丙二酸硼酸锂(LiDFEFMB)和二氟-2-丙基-2-氟丙二酸硼酸锂(LiDFPFMB)。合成并评估了其在锂离子电池中的应用。这些新的盐可溶于碳酸亚乙酯(EC)和碳酸乙基甲基酯(EMC)(以重量计为1:2)的混合物中,并且可以容易地制备1.0M的盐溶液。这些新盐的离子电导率接近LiBF 4和LiPF 6。循环伏安图显示,这些新型的盐基电解质可以钝化天然石墨和高压尖晶石LiNi 0.5 Mn 1.5 O 4(LNMO)形成有效的固体电解质中间相(SEI)。此外,这些新型的盐基电解质在LiNi 0.5 Mn 1.5 O 4和石墨基半电池和全电池中均表现出良好的循环稳定性和高库仑效率。
Are carboxylic esters really refractory to DAST? On the fluorination of α-hydroxyesters with DAST
mixture of ethyl2-(ethoxydifluoromethyl)-2-hydroxyalkanoates, 1,1-bis(ethoxydifluoromethyl)alkan-1-ols when administered at room temperature in dichloromethane. The reaction was exploited in the synthesis of nucleus- and side-chain polyfluorinated indoles. The fluorination of substituted diethyl 2-[(1-tert-butoxycarbonylindol-3-yl)methyl]-2-hydroxymalonates with DAST gave a mixture of ethyl2-(ethoxy