4-isopropylpyrene | 74869-51-5

• 分子结构分类: 有机化合物 - 苯类化合物 - 芘
• 英文名称: 4-isopropylpyrene
• 英文别名: Pyrene, 4-(1-methylethyl)-；4-propan-2-ylpyrene
• CAS: 74869-51-5
• 化学式: C₁₉H₁₆
• 分子量: 244.336
• InChiKey: NIXSYWIQFZOHDU-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.2
• 重原子数：
  19
• 可旋转键数：
  1
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.16
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  4-isopropylpyrene 在 氯氟磺酰 、 五氟化锑 作用下， 以 various solvent(s) 为溶剂， 生成 4-isopropylpyrene dication
  参考文献：
  名称：

  Oxidation of sterically crowded alkyl(cycloalkyl)pyrenes. Persistent dications in SbF5/SO2ClF and radical cations in FSO3H/SO2

  摘要：

  Sterically crowded alkylpyrenes 2-7 undergo two-electron oxidation with SbF5/SO2ClF (or SbF5.FSO3H (9:1)/SO2ClF) to give persistent alkylpyrene dications. In agreement with the charge distribution pattern observed in the parent pyrene dication and with semiempirical calculations (AM1) on isomeric monoisopropylpyrenes dications; the deshielding order C(alpha) > C(alphabeta) > C(beta) was found in their carbon-13 NMR spectra regardless of the number and position of the alkyl substituents. In most cases, the observed DELTAdelta13C for the aromatic ipso-carbon signals of the alkylpyrenium dications relative to those of 1(+2) were slightly larger than expected for a normal substituent effect in the alkylpyrene precursors. Only minor changes (DELTAdelta13C) in the unsubstituted positions were observed, except for the ring carbons in highly crowded locations for which a noticeable upfield shift was detected. The H-1 NMR spectra of alkylpyrenium dications showed a much greater substituent dependency. Low temperature reactions of the less-reactive pyrene and 2,7-di-tert-butylpyrene with SbF5/SO2ClF led primaryl to sulfonylation sigma-complexes rather than oxidation dications. Persistent alkylpyrene radical cations were found to coexist with the alkylpyrenium ions of protonation in FSO3H/SO2 (ESR detection) without any noticeable line broadening in the NMR spectra of the Wheland intermediates.

  DOI：

  10.1021/jo00067a049
• 作为产物：
  描述：

  4-acetyl-1,2,3,6,7,8-hexahydropyrene 在 镍 盐酸 、 氢气 、 2,3-二氯-5,6-二氰基-1,4-苯醌 作用下， 以 乙醚 、 乙酸乙酯 为溶剂， 25.0 ℃ 、202.65 kPa 条件下， 反应 6.5h， 生成 4-isopropylpyrene
  参考文献：
  名称：

  Berg, Arne; Lam, Joergen; Hansen, Poul Erik, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1986, vol. 40, # 8, p. 665 - 677

  摘要：

  DOI：

文献信息

• Nitration of isopropylpyrenes. Strained models for protonation and transfer-nitration in the condensed phase
  作者：Kenneth Khosrow Laali、Tze Ming Liang、Poul Erik Hansen

  DOI：10.1021/jo00035a022

  日期：1992.4

  Protic mono- and dinitration of 1,3,5,7,9-pentaisopropylpyrene (1) occurred at the available alpha positions to give 2 and 3. Despite steric crowding, 2 and 3 did not exhibit a torsional barrier to i-Pr rotation at ambient temperatures; however, buttressing of the peri i-Pr groups was evident (H-1 NMR, UV, and force field energy minimizations). Persistent (dihydroxyiminium)pyrenium dications 2a+2 and 3a+2 were formed by low temperature protonation of 2 and 3 with CF3SO3H (TfOH)/SO2 or with FSO3H/SO2. Intramolecular cyclization of the nitro group of 2a+2 gave the rearranged pyrenium ion 2c+. 1 reacted with NO2+BF4- in acetonitrile solvent to give two pyrenium ions stable at rt, viz. the Wheland intermediate of alpha-nitration 2b+2 and the (dihydroxyiminium)pyrenium dication 2a+2; the latter was also the predominant pyrenium ion formed in the reaction of 1 with NO+BF4- in acetonitrile. Reaction of 1 with NO2+BF4- in chloroform solvent gave alpha-nitration products and a persistent radical cation RC. The simultaneous presence of alpha-nitration products and a persistent pyrenium RC was also observed in the reaction of 1 with NO+BF4- in chloroform, where broader NMR line widths and a stronger ESR signal suggested more extensive oxidation. Protic and aprotic nitrations of 1,3,6,8-tetraisopropylpyrene (10) occurred at the alpha-beta positions; a minor addition product (26) was also found. A mixture of isomeric dinitropyrenes was obtained in NO2+ nitration of 1-isopropylpyrene (13). In line with low temperature protonation studies, aprotic nitrations of 2-isopropyl- and 4-isopropylpyrenes occurred predominantly at the alpha positions. The crowded pyrenium ion of 3 and 2 transfer nitrate to aromatics (toluene, mesitylene, benzene) under mild conditions in competition with a more facile transalkylation.
• Moyle; Ritchie, Australian Journal of Chemistry, 1958, vol. 11, p. 211,220
  作者：Moyle、Ritchie

  DOI：——

  日期：——
• Protonation and sulfinylation of isomeric isopropylpyrenes, 2,7-di-tert-butylpyrene, and tetracyclohexyl- and tetracyclopentylpyrenes: remarkably stable, sterically crowded pyrenium cations
  作者：Kenneth Khosrow Laali、Poul Erik Hansen

  DOI：10.1021/jo00024a018

  日期：1991.11

  1-Isopropyl- (1), 2-isopropyl- (2), 4-isopropyl- (3), 1,3,6,8-tetraisopropyl- (4), and 1,3,5,7,9-pentaisopropylpyrene (5), 2,7-di-tert-butylpyrene (6), and 1,3,5,8-tetracyclohexyl- (7) and 2,4,7,9-tetracyclopentylpyrene (8) in FSO3H or CF3SO3H (TfOH) in SO2 or SO2ClF solvent gave stable monopyrenium ions. In agreement with theory, exclusive alpha protonation occurred at low temperature (-75 --> -65-degrees-C) irrespective of the position of the substituents. The position of alpha-protonation is controlled by inductive stabilization of the alkyl (cycloalkyl) groups. Unlike hexahydropyrene which is diprotonated in FSO3H.SbF5 (1:1) Magic acid, with isopropylpyrenes stable dications could not be generated; in SO2 solvent the Wheland intermediates of sulfinylation were observed, whereas in SO2ClF solvent oxidation and monoprotonation were competitive. Charge distribution patterns in the sulfinylation sigma-complexes are similar to those of protonated pyrenium ions. Stable pyrenium cations deprotonate or desulfinylate on quenching without dealkylation or disproportionation. At higher temperatures (ca. -40-degrees-C), ipso-protonated 4 undergoes isomerization in FSO3H/SO2 solvent; other alkyl (cycloalkyl)pyrenium cations show no isomerization/disproportionation. Upon standing in Magic Acid, hexahydropyrene is oxidized to pyrene.
• BERG A.; LAM J.; HANSEN P. E., ACTA CHEM. SCAND., 40,(1986) N 8, 665-677
  作者：BERG A.、 LAM J.、 HANSEN P. E.

  DOI：——

  日期：——
• Berg, Arne; Lam, Joergen; Hansen, Poul Erik, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1986, vol. 40, # 8, p. 665 - 677
  作者：Berg, Arne、Lam, Joergen、Hansen, Poul Erik

  DOI：——

  日期：——

表征谱图