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Related Concept Videos

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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.
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
Nomenclature of Aromatic Compounds with Multiple Substituents01:11

Nomenclature of Aromatic Compounds with Multiple Substituents

When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...
Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
Alkyl Halides02:45

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Benzodichalcogenophenes with perfluoroarene termini.

Yongfeng Wang1, Sean R Parkin, Mark D Watson

  • 1Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA.

Organic Letters
|September 20, 2008
PubMed
Summary

New benzodichalcogenophenes were synthesized using SN Ar reactions. These functionalized organic semiconductors exhibit tunable LUMO energy levels and form pi-stacked crystal structures, crucial for electronic applications.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Solid-State Physics

Background:

  • Benzodichalcogenophenes are a class of organic semiconductors with potential applications in electronics.
  • Functionalization strategies are key to tuning their electronic and structural properties.

Purpose of the Study:

  • To synthesize novel benzodichalcogenophene derivatives.
  • To investigate the impact of varying substituents (X, Y, W) on LUMO energy levels.
  • To determine the crystallization motifs of the new derivatives.

Main Methods:

  • Nucleophilic Aromatic Substitution (SN Ar) reactions were employed to functionalize bismetalated benzodichalcogenophenes with perfluoroarenes.
  • Systematic variation of terminal groups (X, Y, W) was performed.
  • X-ray crystallography was used to analyze the solid-state structures.

Main Results:

  • A series of new benzodichalcogenophene derivatives were successfully synthesized.
  • The study identified correlations between substituent identity and LUMO energy levels.
  • X-ray crystallography revealed that most derivatives form coplanar ring systems within slipped 1D or 2D pi-stacks.

Conclusions:

  • The SN Ar reaction provides an effective route for functionalizing benzodichalcogenophenes.
  • Tuning substituents allows for control over electronic properties (LUMO levels).
  • The observed pi-stacking motifs are important for charge transport in organic electronic devices.