1-(4-dimethylaminophenyl)ethyl cation | 82414-94-6

• 分子结构分类: 有机化合物 - 有机氮化合物
• 英文名称: 1-(4-dimethylaminophenyl)ethyl cation
• 英文别名: 1-(4-(dimethylamino)phenyl)ethyl carbocation；(4-Ethylidenecyclohexa-2,5-dien-1-ylidene)-dimethylazanium；(4-ethylidenecyclohexa-2,5-dien-1-ylidene)-dimethylazanium
• CAS: 82414-94-6
• 化学式: C₁₀H₁₄N
• 分子量: 148.228
• InChiKey: PXRGWKSMXCCWNV-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  11
• 可旋转键数：
  0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  3
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  1-(4-dimethylaminophenyl)ethyl cation 在 水 作用下， 以 水 为溶剂， 生成 1-[4-(N,N-dimethylamino)phenyl]ethanol
  参考文献：
  名称：

  环取代的 1-苯乙基碳正离子的形成和稳定性

  摘要：

  描述 de l'utilisation d'azoture et de thiolate entant que reactifs de piegeage controlant la diffusion afin d'evaluer les constantes de vitesse des反应 des carboccations aryl-1 ethyles avec le solvant et ses composants en fonction de la structure du carbocation,溶剂组合物和浓缩液

  DOI：

  10.1021/ja00317a031
• 作为产物：
  描述：

  1-[4-(N,N-dimethylamino)phenyl]ethanol 在 氢气 作用下， 以 水 为溶剂， 生成 1-(4-dimethylaminophenyl)ethyl cation
  参考文献：
  名称：

  环取代的 1-苯乙基碳正离子的形成和稳定性

  摘要：

  描述 de l'utilisation d'azoture et de thiolate entant que reactifs de piegeage controlant la diffusion afin d'evaluer les constantes de vitesse des反应 des carboccations aryl-1 ethyles avec le solvant et ses composants en fonction de la structure du carbocation,溶剂组合物和浓缩液

  DOI：

  10.1021/ja00317a031

文献信息

• Lifetimes and UV-visible absorption spectra of benzyl, phenethyl, and cumyl carbocations and corresponding vinyl cations. A laser flash photolysis study
  作者：Frances L Cozens、V M Kanagasabapathy、Robert A McClelland、Steen Steenken

  DOI：10.1139/v99-210

  日期：1999.12.5

  Benzyl (4-MeO, 4-Me, and 4-methoxy-1-naphthylmethyl), phenethyl (4-Me₂N, 4-MeO, 3,4-(MeO)₂, 4-Me, 3-Me, 4-F, 3-MeO, 2,6-Me₂, parent, and 4-methoxy-1-naphthylethyl) and cumyl (4-Me₂N, 4-MeO, 4-Me, parent) cations have been studied by laser flash photolysis (LFP) in 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoroisopropanol (HFIP). In most cases styrene or α-methylstyrene precursors were employed for the phenethyl and cumyl ions, the intermediate being obtained by solvent protonation of the excited state. Benzyl cations were generated by photoheterolysis of trimethylammonium and chloride precursors. While a 4-MeO substituent provides sufficient stabilization to permit observation of cations in TFE, cations with less stabilizing substituents usually require the less nucleophilic HFIP. Even in this solvent, the parent benzyl cation is too short-lived (lifetime <20 ns) to be observed. When generated in HFIP, phenethyl cations can be seen to react with unphotolyzed styrene, giving rise to dimer cations that are observed to grow in as the initial phenethyl cation decays. The dimer cations, in common with the oligomer cations seen in cationic styrene polymerization, have a λ_max 15-20 nm higher than the monomer and react with both solvent and styrene several orders of magnitude more slowly. This stabilization relative to the phenethyl may reflect an interaction with the aryl group present at the gamma-carbon. Cations 4-MeOC₆H₄C⁺(R)-CH₃ (R = Me, Et, i-Pr, t-Bu, cyclopropyl, C₆H₅, 4-MeOC₆H₄) were generated in TFE via the photoprotonation route. The alkyl series shows that steric effects are important in the decay reaction. The cation with R = cyclopropyl is a factor of 1.5 less reactive than the cation where R = phenyl. Several vinyl cations have also been generated by photoprotonation of phenylacetylenes. ArC⁺=CH₂ has a reactivity very similar to that of its analog ArC⁺H-CH₃, the vinyl cation being slightly (factors of 2-5) shorter-lived. For the various series of cations, including vinyl, substituents in the aryl ring have a consistent effect on the λ_max, a shift to higher wavelength relative to hydrogen of 15 nm for 4-Me, 30 nm for 4-MeO, and 50 nm for 4-Me₂N.Key words: photogenerated carbocations, carbocation lifetime, styrene, photoprotonation.

  苯甲基（4-MeO，4-Me和4-甲氧基-1-萘基甲基）、苯乙基（4-Me2N，4-MeO，3,4-(MeO)2，4-Me，3-Me，4-F，3-MeO，2,6-Me2，母体和4-甲氧基-1-萘基乙基）和叔丁基（4-Me2N，4-MeO，4-Me，母体）阳离子在2,2,2-三氟乙醇（TFE）和1,1,1,3,3,3-六氟异丙醇（HFIP）中通过激光闪光光解（LFP）进行了研究。在大多数情况下，苯乙烯或α-甲基苯乙烯前体被用于苯乙基和叔丁基离子，中间体通过溶剂质子化激发态而获得。苯甲基阳离子是通过三甲基铵和氯化物前体的光异裂生成的。虽然4-MeO取代基提供了足够的稳定性以在TFE中观察到阳离子，但具有较少稳定取代基的阳离子通常需要较不亲核的HFIP。即使在这种溶剂中，母体苯甲基阳离子也太短寿命（寿命<20 ns）而无法观察到。在HFIP中生成的苯乙基阳离子可以看到与未经光解的苯乙烯反应，导致观察到的二聚体阳离子在初始苯乙基阳离子衰减时增长。与阳离子苯乙烯聚合中观察到的寡聚体阳离子一样，二聚体阳离子的λmax比单体高15-20 nm，并且与溶剂和苯乙烯反应速度慢几个数量级。相对于苯乙基的这种稳定性可能反映了与伽马碳上存在的芳基的相互作用。在TFE中通过光质子化途径生成了4-MeOC6H4C+(R)-CH3（R = Me，Et，i-Pr，t-Bu，环丙基，C6H5，4-MeOC6H4）阳离子。烷基系列表明立体效应在衰减反应中很重要。当R = 环丙基时，其反应性比R = 苯基的阳离子少1.5倍。还通过对苯乙炔的光质子化生成了几种乙烯阳离子。ArC+=CH2的反应性与其类似物ArC+H-CH3非常相似，乙烯阳离子寿命略短（2-5倍因子）。对于包括乙烯在内的各系列阳离子，芳香环中的取代基对λmax有一致的影响，相对于氢的15 nm的4-Me，30 nm的4-MeO和50 nm的4-Me2N的波长偏移。关键词：光产生的碳正离子，碳正离子寿命，苯乙烯，光质子化。
• How does a reaction change its mechanism? General base catalysis of the addition of alcohols to 1-phenylethyl carbocations
  作者：Rachel. Ta-Shma、William P. Jencks

  DOI：10.1021/ja00285a027

  日期：1986.12

  for general base catalysis of the addition of alcohols to 1-(4-(dimethylamino)phenyl)ethyl and 1-(4-methoxyphenyl)ethyl carbocations in 50:40:10 H/sub 2/O: CF/sub 3/CH/sub 2/OH:ROH. The addition of trifluoroethanol to the relatively stable ((dimethylamino)phenyl)ethyl cation is catalyzed by substituted acetate ions with ..beta.. = 0.33, which is larger than ..beta.. = 0.23 for addition to the (methoxyphenyl)ethyl

  报告了在 50:40:10 H/sub 2/O 中将醇加成到 1-(4-(二甲氨基)苯基)乙基和 1-(4-甲氧基苯基)乙基碳正离子的一般碱催化的结构反应相关性： CF/sub 3/CH/sub 2/OH:ROH。三氟乙醇与相对稳定的（（二甲氨基）苯基）乙基阳离子的加成由具有..β.. = 0.33的取代乙酸根离子催化，这大于..β.. = 0.23添加到（甲氧基苯基）乙基阳离子。对于更稳定的碳正离子，催化作用更为重要，但随着醇碱度的增加，催化作用下降得更快。对于醇加成到 1-苯乙基碳正离子的水催化，随着碳正离子稳定性的增加（哈蒙德效应），对 ROH 碱性的敏感性增加。这表明在过渡态中质子转移的参与很小，并且与 ROH 与碱的简单氢键合一致；它由正相互作用系数 p/sub yy'/ = delta..beta../sub nuc//-deltasigma 描述。然而，对于乙酸盐催化的反应，随着碳正离子稳定性的增加，对
• Cozens, Frances L.; Mathivanan, N.; McClelland, Robert A., Journal of the Chemical Society. Perkin transactions II, 1992, # 12, p. 2083 - 2090
  作者：Cozens, Frances L.、Mathivanan, N.、McClelland, Robert A.、Steenken, Steen

  DOI：——

  日期：——
• Formation and stability of ring-substituted 1-phenylethyl carbocations
  作者：John P. Richard、Marc E. Rothenberg、William P. Jencks

  DOI：10.1021/ja00317a031

  日期：1984.3

  l'utilisation d'azoture et de thiolate en tant que reactifs de piegeage controlant la diffusion afin d'evaluer les constantes de vitesse des reactions des carbocations aryl-1 ethyles avec le solvant et ses composants en fonction de la structure du carbocation, la composition du solvant et la concentration en sel

  描述 de l'utilisation d'azoture et de thiolate entant que reactifs de piegeage controlant la diffusion afin d'evaluer les constantes de vitesse des反应 des carboccations aryl-1 ethyles avec le solvant et ses composants en fonction de la structure du carbocation,溶剂组合物和浓缩液