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NMR Spectroscopy of Benzene Derivatives

NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...

Structure of Benzene: Molecular Orbital Model

Structure of Benzene: Molecular Orbital Model

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).

Structure of Benzene: Kekulé Model

Structure of Benzene: Kekulé Model

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.

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...

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Summary

Solid-state reactions are governed by microscopic mechanisms. Lattice phonons tune molecular distances, revealing a critical intermolecular C-C distance of 2.6 Å for benzene transformation, independent of conditions.

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Area of Science:

Solid-state chemistry
Materials science
Chemical physics

Background:

Understanding solid-state reaction mechanisms is key for designing materials.
The existence of a critical distance for crystal reactivity remains debated.
The influence of lattice phonons on molecular proximity is not fully understood.

Purpose of the Study:

To investigate the role of lattice phonons in solid-state reactivity.
To determine if a critical intermolecular distance exists for crystalline benzene transformation.
To explore the influence of pressure and temperature on this critical distance.

Main Methods:

First-principles molecular-dynamics simulations were employed.
Analysis focused on the transformation of crystalline benzene to amorphous hydrogenated carbon.
Intermolecular distances were calculated considering collective atomic motions.

Main Results:

A constant intermolecular C-C distance of approximately 2.6 Å was identified at the reaction onset.
This critical distance was found to be independent of applied pressure and temperature.
Lattice phonons were shown to play a crucial role in fine-tuning nearest-neighbor distances.

Conclusions:

Lattice phonons are critical in driving solid-state reactivity by controlling intermolecular distances.
A universal critical C-C distance of 2.6 Å governs benzene's transformation.
This finding has implications for planning solid-state reactions under moderate pressure.