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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

7.4K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
7.4K
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.4K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.3K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.1K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Changes to the dissociation barrier of H<sub>2</sub> due to buckling induced by a chemisorbed hydrogen on a doped graphene surface.

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Cycloaddition between nitrogen-doped graphene (6π-component) and benzene (4π-component): a theoretical approach using

E Rangel-Cortes1, J A Pescador-Rojas1, V A Cardozo-Mata1

  • 1Escuela Superior Apan, Universidad Autónoma del Estado de Hidalgo. Carretera Apan-Capulalpan s/n, Colonia, 43920 Chimalpa Tlalayote, Hgo, Mexico. eduardo_rangel@uaeh.edu.mx.

Physical Chemistry Chemical Physics : PCCP
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Nitrogen-doped graphene

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Surface Science

Background:

  • Graphene's unique electronic properties are tunable via doping.
  • Nitrogen doping introduces defects that can alter graphene's reactivity.
  • Understanding defect-specific interactions is crucial for novel material design.

Purpose of the Study:

  • Investigate the reactivity of specific nitrogen-doped graphene defects with benzene.
  • Determine the mechanism and energetic barriers of observed reactions.
  • Explore the electronic structure implications of these interactions.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Van der Waals Density Functional (vdW-DF) correction for accurate interaction modeling.
  • Analysis of electronic band structures (HOMO/LUMO) and orbital symmetries.

Main Results:

  • Identified the N3V3 pyrrolic defect as the sole reactive site for benzene cycloaddition.
  • Observed the formation of a cycloadduct with energy barriers below 154.38 kJ mol-1 (1.60 eV).
  • N3V3 defect exhibits degenerate conduction and valence bands with identical ionization potential and electron affinity.

Conclusions:

  • The N3V3 pyrrolic defect acts as a 6π-component in cycloaddition reactions with benzene.
  • Reactions follow Woodward and Hoffmann principles of orbital symmetry.
  • Demonstrates substitutionally doped graphene's potential in cycloaddition chemistry for the first time.