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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
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Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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IPr*F - Highly Hindered, Fluorinated N-Heterocyclic Carbenes.

Greta Utecht-Jarzyńska1,2, Shicheng Shi1, Pengcheng Gao1

  • 1Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 19, 2024
PubMed
Summary

Researchers developed new fluorinated N-heterocyclic carbenes (NHCs) with tunable properties. These sterically-hindered ligands offer enhanced stabilization for reactive metal centers, advancing organometallic chemistry and catalysis.

Keywords:
Fluorinated NHCsLigand designMetal stabilizationN-heterocyclic carbenes

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Area of Science:

  • Organometallic Chemistry
  • Fluorine Chemistry
  • Catalysis

Background:

  • Fluorine incorporation influences molecular properties due to high electronegativity and C-F bond polarization.
  • Sterically-hindered N-heterocyclic carbenes (NHCs) stabilize reactive metal centers, enabling synthesis of versatile organometallic compounds.
  • NHCs find broad applications in main group chemistry, inorganic synthesis, and transition-metal catalysis.

Purpose of the Study:

  • To report the first class of sterically-hindered, fluorinated N-heterocyclic carbenes (NHCs).
  • To enable tunable steric and electronic properties of the carbene center through variable fluorine substitution.
  • To provide broad access to these novel fluorinated ligands for research and industry.

Main Methods:

  • Development of an efficient, one-pot synthesis for fluorinated IPr*F ligands.
  • Evaluation of steric, electron-donating, and π-accepting properties of the novel ligands.
  • Investigation of coordination chemistry with Au(I), Rh(I), and Se.

Main Results:

  • Successful synthesis of a novel class of sterically-hindered, fluorinated NHC ligands.
  • Demonstration of tunable steric and electronic characteristics via fluorine substitution.
  • Characterization of coordination complexes with Au(I), Rh(I), and Se, showcasing ligand utility.

Conclusions:

  • The novel fluorinated NHC ligands offer unique properties due to the influence of fluorine.
  • These ligands are anticipated to be valuable in stabilizing reactive metal centers.
  • Widespread applications in catalysis and materials science are expected.