1-acetyl-dibenzofuran | 119490-17-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并呋喃
• 英文名称: 1-acetyl-dibenzofuran
• 英文别名: 1-acetyldibenzofuran；1-Dibenzofuran-1-ylethanone
• CAS: 119490-17-4
• 化学式: C₁₄H₁₀O₂
• 分子量: 210.232
• InChiKey: GIVDFDNVDUDVTB-UHFFFAOYSA-N

物化性质

• 沸点：
  361.6±15.0 °C(Predicted)
• 密度：
  1.222±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.3
• 重原子数：
  16
• 可旋转键数：
  1
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.07
• 拓扑面积：
  30.2
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  邻氯苯甲酸钾 在 铜 甲醇 、 sodium methylate 、 potassium carbonate 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 3.0h， 生成 1-acetyl-dibenzofuran
  参考文献：
  名称：

  一些邻位取代的苯基自由基的气相生成和环化反应

  摘要：

  在900°C（10 -2 Torr）下对烯丙基酯2（X = O，S，CH 2，CO）进行快速真空热解，分别得到二苯并呋喃，二苯并噻吩，芴和芴酮。该机理涉及在环化之前通过六元过渡态通过分子内氢转移而平衡的苯基自由基中间体1 。

  DOI：

  10.1016/s0040-4020(01)90385-0

文献信息

• Synthesis of Dibenzofurans via C–H Activation of <i>o</i>-Iodo Diaryl Ethers
  作者：Niranjan Panda、Irshad Mattan、Dinesh Kumar Nayak

  DOI：10.1021/acs.joc.5b00634

  日期：2015.7.2

  An efficient method for the synthesis of dibenzofuran from o-iododiaryl ether using reusable Pd/C under ligand-free conditions has been developed. Synthesis of o-iododiaryl ether was achieved in one pot through sequential iodination and O-arylation of phenol under mild reaction conditions.

  已经开发了一种在无配体条件下使用可重复使用的Pd / C由邻碘二芳基醚合成二苯并呋喃的有效方法。在温和的反应条件下，通过顺序碘化和苯酚的邻芳基化，可以在一锅中完成邻碘二芳基醚的合成。
• A Remarkable Difference of the Positional Selectivity in Electrophilic Aromatic Substitution of Dibenzofuran between the Classical σ-Complex and Charge-Transfer Mechanisms
  作者：Takashi Keumi、Kozo Hamanaka、Haruo Hasegawa、Naoki Minamide、Yoshinori Inoue、Hidehiko Kitajima

  DOI：10.1246/cl.1988.1285

  日期：1988.8.5

  Electrophilic nitration of dibenzofuran with nitric acid by a charge-transfer mechanism occurs exclusively at the 3-position and on the other hand, substitution at the 2-position predominates in the acylation, in which a classical σ-complex mechanism is important.

  二苯并呋喃与硝酸通过电荷转移机制的亲电硝化仅发生在 3-位，另一方面，2-位的取代在酰化中占主导地位，其中经典的 σ-络合物机制很重要。
• Positional reactivity of dibenzofuran in electrophilic substitutions
  作者：Takashi Keumi、Naoto Tomioka、Kozo Hamanaka、Hirohito Kakihara、Toshio Morita、Hidehiko Kitajima、Masahiko Fukushima

  DOI：10.1021/jo00015a020

  日期：1991.7

  Isomer distributions of dibenzofuran (DBF) in Friedel-Crafts acylations, Friedel-Crafts alkylations, and nitrations have been determined. The 2- and 3-positions of DBF represents most of the total reactivity. However, the ratio of 2- to 3-isomers greatly varied, depending on the nature of the electrophile. The positional reactivities have been found to be in the following sequence: 2- > 3- > 1- > 4-positions for Friedel-Crafts acylations, Friedel-Crafts benzylations, and nitrations with alkyl nitrate/Lewis acid or nitronium tetrafluoroborate. The ratios for acylations varied over a range from 13.1 to 2.9, while for benzylations and nitrations from 2.0 to 1.0. In contrast, for nitrations of DBF with nitric acid a different reactivity order was found: 3- > 2- > 1- > 4-, with the ratio varying from 0.8 to 0.03 depending on the nature of solvents used. The selectivity for the 3-substitution increased with increase in nitronium ion-like character of nitrating reagents. In particular, nitration with nitric acid in dichloromethane gave mostly 3-nitro-DBF (95% of the four possible isomeric mixture). The charge-transfer nitration with tetranitromethane under the UV irradiation has shown a similar isomer distribution to that in nitration with nitric acid. The MNDO calculations predicts that the late transition-state model (by sigma-complex) favors reactions at the 2-position while the early transition-state model (by HOMO electron density) leads to the 3-substitution.
• US4251341A
  申请人：——

  公开号：US4251341A

  公开（公告）日：1981-02-17