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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...

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...

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).

Reactions at the Benzylic Position: Oxidation and Reduction

Reactions at the Benzylic Position: Oxidation and Reduction

The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.

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.

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

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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Related Experiment Video

Updated: Jun 17, 2026

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

Peripheral blood effects in benzene-exposed workers.

A Robert Schnatter¹, Patrick J Kerzic, Yimei Zhou

¹ExxonMobil Biomedical Sciences, Inc, 1545 Route 22 East, Annandale, NJ 08801, United States. a.r.schnatter@exxonmobil.com

Chemico-Biological Interactions

|December 26, 2009

Summary

Benzene exposure can harm blood cells, with neutrophils and mean platelet volume being most sensitive. Higher concentrations (>10 ppm) showed effects on red blood cells, indicating occupational health risks.

Related Experiment Videos

Last Updated: Jun 17, 2026

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

Area of Science:

Occupational Health
Toxicology
Hematology

Background:

Benzene exposure is linked to hematotoxicity, potentially causing adverse health outcomes.
Understanding peripheral blood effects is crucial for assessing benzene's occupational risks.

Purpose of the Study:

To investigate the relationship between benzene exposure levels and peripheral blood indices in Chinese factory workers.
To identify specific blood parameters most sensitive to benzene and determine critical exposure concentrations.

Main Methods:

Studied 928 workers in Shanghai factories with varying benzene exposure levels (0.07–872 mg/m³).
Collected demographic, lifestyle, and genetic data (NQO1, MPO, CYP2E1, GSTT1 polymorphisms).
Monitored individual benzene exposure and analyzed twelve peripheral blood indices.

Main Results:

Red blood cell indices (anemia, macrocytosis) showed effects at higher benzene exposures (>10 ppm).
Neutrophils and mean platelet volume (MPV) were most sensitive, with changes observed at 7.8–8.2 ppm benzene.
Toluene exposure was identified as a potential confounding factor.

Conclusions:

Peripheral blood changes, particularly in neutrophils and MPV, are sensitive indicators of benzene exposure.
Occupational health surveillance should monitor these blood indices and consider co-exposure to toluene.