2,6-difluorophenolate anion

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 2,6-difluorophenolate anion
• 英文别名: 2,6-difluorophenolate；di-orto-fluorophenolate
• 化学式: C₆H₃F₂O
• 分子量: 129.086
• InChiKey: CKKOVFGIBXCEIJ-UHFFFAOYSA-M

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  9
• 可旋转键数：
  0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  23.1
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  2,6-difluorophenolate anion 、 氯乙酸 生成 2,6-difluorophenoxyacetic acid
  参考文献：
  名称：

  Skeletal rearrangements preceding CO loss from metastable phenoxymethylene ions derived from phenoxyacetic acid and anisole

  摘要：

  AbstractThe loss of CH2˙ from the molecular ion of phenoxyacetic acid and the expulsion of an H˙ atom from ionized anisole lead to phenoxymethylen ions, which fragment predominantly by CO loss on the microsecond time‐scale. Carbon‐13 labelling reveals that ∼90% of the CO molecules expelled from the metastable ions derived from phenoxyacetic acid incorporate the carbon atom from the 1‐position of the phenyl group of the parent compound, whereas the residual CO molecules contain one of the other carbon atoms of the aromatic ring. The 2‐fluoro‐ and 2‐methylphenoxymethylene ions derived from the appropriate aryloxyacetic acids behave similarly, i.e. the carbon atom of the methylene group of the parent compound is not incorporated in the expelled CO molecules. In contrast, ∼45% of the CO molecules eliminated from the metastable phenoxymethylene ions formed from ionized anisole contain the carbon atom of the methyl group, while the remaining part contains the carbon atom from the 1‐position of the phenyl ring of the parent compound. This result is taken as evidence for the occurrence of a skeletal rearrangement of the anisole molecular ion leading to an interchange between the carbon atom of the methyl group and the carbon atom at the 1‐position of the ring. The elimination of CO from the metastable ions generated from either phenoxyacetic acid or anisole gives rise to a composite metastable peak. Conclusive evidence as to the formation of [C7H7O]+ isomers other than the phenoxymethylene ion is not obtained, indicating that the composite metastable peak is a result of two competing reactions both leading to CO loss. Possible mechanisms of these reactions are discussed together with the mechanism of the skeletal rearrangement of the molecular ion of anisole prior to H˙ loss.

  DOI：

  10.1002/oms.1210281031

文献信息

• Structure-reactivity correlations for reactions of substituted phenolate anions with acetate and formate esters
  作者：Dimitrios Stefanidis、Sayeon Cho、Sirano Dhe-Paganon、William P. Jencks

  DOI：10.1021/ja00058a006

  日期：1993.3

  substituted phenolate anions with m-nitrophenyl, p-nitrophenyl, and 3,4-dinitrophenyl formates follow nonlinear BrOnsted-type correlations that might be taken as evidence for a change in the rate-limiting step of a reaction that proceeds through a tetrahedral addition intermediate. However, the correlation actually represents two different BrOnsted lines that are defined by meta- and para-substituted phenolate

  取代苯酚阴离子与间硝基苯基、对硝基苯基和 3,4-二硝基苯基甲酸酯的反应遵循非线性 BrOnsted 型相关性，可以作为反应的限速步骤发生变化的证据。四面体加成中间体。然而，相关性实际上代表了两个不同的布朗斯特线，它们由间位和对位取代的苯酚阴离子以及间位和对位取代的邻氯苯酚阴离子定义。在 ΔpK=0 时，在每一类 BrOnsted 相关性中攻击和离开酚酸阴离子的 BrOnsted 斜率没有可检测的变化，这支持了乙酰基和甲酰基转移反应的协调机制
• Kinetic and theoretical study on nucleofugality in the phenolysis of 3-nitrophenyl and 4-nitrophenyl 4-cyanophenyl thionocarbonates
  作者：Enrique A. Castro、Alvaro Cañete、Paola R. Campodónico、Marjorie Cepeda、Paulina Pavez、Renato Contreras、José G. Santos

  DOI：10.1016/j.cplett.2013.04.002

  日期：2013.5

  evaluate the nucleofugality of the corresponding leaving groups. For the reaction of 2 only 4-nitrophenoxide is obtained as leaving group. For the reaction of 1 the nucleofugality ratio 3-nitrophenoxide/4-cyanophenoxide is 1/3 from the corresponding T− intermediate. Theoretical calculations confirm the experimental results. From these results it can be concluded that the non-leaving group affects the

  对3-硝基苯基4-氰基苯基硫代碳酸酯（1）和4-硝基苯基4-氰基苯基硫代碳酸酯（2）的酚醛化进行动力学研究，以评估相应离去基团的核键性。对于2的反应，仅获得4-硝基苯氧基作为离去基团。对于反应1的nucleofugality比率3-硝基苯酚/ 4- cyanophenoxide是从相应的T 1/3 -中间体。理论计算证实了实验结果。从这些结果可以得出结论，非离去基团影响核不纯率。
• Oxamyl dipeptide caspase inhibitors developed for the treatment of stroke
  作者：Steven D. Linton、Teresa Aja、Peter R. Allegrini、Thomas L. Deckwerth、Jose-Luis Diaz、Bastian Hengerer、Julia Herrmann、Kathy G. Jahangiri、Joerg Kallen、Donald S. Karanewsky、Steven P. Meduna、Kip Nalley、Edward D. Robinson、Silvio Roggo、Giorgio Rovelli、Andre Sauter、Robert O. Sayers、Albert Schmitz、Robert Smidt、Robert J. Ternansky、Kevin J. Tomaselli、Brett R. Ullman、Christoph Wiessner、Joe C. Wu

  DOI：10.1016/j.bmcl.2003.12.106

  日期：2004.5

  Structural modifications were made to a previously described acyl dipeptide caspase inhibitor, leading to the oxamyl dipeptide series. Subsequent SAR studies directed toward the warhead, P2, and P4 regions of this novel peptidomimetic are described herein. (C) 2004 Elsevier Ltd. All rights reserved.
• Skeletal rearrangements preceding CO loss from metastable phenoxymethylene ions derived from phenoxyacetic acid and anisole
  作者：Tineke A. Molenaar-Langeveld、Steen Ingemann、Nico M. M. Nibeering

  DOI：10.1002/oms.1210281031

  日期：1993.10

  AbstractThe loss of CH2˙ from the molecular ion of phenoxyacetic acid and the expulsion of an H˙ atom from ionized anisole lead to phenoxymethylen ions, which fragment predominantly by CO loss on the microsecond time‐scale. Carbon‐13 labelling reveals that ∼90% of the CO molecules expelled from the metastable ions derived from phenoxyacetic acid incorporate the carbon atom from the 1‐position of the phenyl group of the parent compound, whereas the residual CO molecules contain one of the other carbon atoms of the aromatic ring. The 2‐fluoro‐ and 2‐methylphenoxymethylene ions derived from the appropriate aryloxyacetic acids behave similarly, i.e. the carbon atom of the methylene group of the parent compound is not incorporated in the expelled CO molecules. In contrast, ∼45% of the CO molecules eliminated from the metastable phenoxymethylene ions formed from ionized anisole contain the carbon atom of the methyl group, while the remaining part contains the carbon atom from the 1‐position of the phenyl ring of the parent compound. This result is taken as evidence for the occurrence of a skeletal rearrangement of the anisole molecular ion leading to an interchange between the carbon atom of the methyl group and the carbon atom at the 1‐position of the ring. The elimination of CO from the metastable ions generated from either phenoxyacetic acid or anisole gives rise to a composite metastable peak. Conclusive evidence as to the formation of [C7H7O]+ isomers other than the phenoxymethylene ion is not obtained, indicating that the composite metastable peak is a result of two competing reactions both leading to CO loss. Possible mechanisms of these reactions are discussed together with the mechanism of the skeletal rearrangement of the molecular ion of anisole prior to H˙ loss.