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Related Concept Videos

NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

9.1K
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...
9.1K
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

10.3K
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.
10.3K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

10.3K
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).
10.3K
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

3.4K
When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
3.4K
Reactions at the Benzylic Position: Oxidation and Reduction00:59

Reactions at the Benzylic Position: Oxidation and Reduction

4.2K
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.
4.2K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

9.0K
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...
9.0K

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Updated: Oct 2, 2025

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay
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Sex Difference and Benzene Exposure: Does It Matter?

Diana Poli1, Paola Mozzoni2,3, Silvana Pinelli2

  • 1INAIL Research, Department of Occupational and Environmental Medicine, Epidemiology and Hygiene Via Fontana Candida 1, 00078 Monte Porzio Catone, Italy.

International Journal of Environmental Research and Public Health
|February 25, 2022
PubMed
Summary

Sex influences benzene

Keywords:
benzenebiomarkersepidemiological surveysin vivo studiessex

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Area of Science:

  • Toxicology
  • Environmental Health
  • Occupational Medicine

Background:

  • Biological sex differences can alter responses to environmental risk factors.
  • Benzene exposure is a known health concern, particularly in occupational settings.

Purpose of the Study:

  • To investigate sex as a discriminant factor in benzene-induced health outcomes.
  • To review existing human and animal studies on benzene exposure and sex-specific effects.

Main Methods:

  • Conducted a scoping review of human and animal studies on benzene exposure.
  • Analyzed data on genotoxicity, hematotoxicity, metabolism, blood parameters, and leukemia incidence.

Main Results:

  • Male animals showed higher susceptibility to benzene's adverse effects in vivo.
  • Human studies indicated women have a higher risk of blood system effects and increased benzene metabolism.
  • Observed a discrepancy between animal and human findings, cautioning against direct extrapolation.

Conclusions:

  • Sex is a critical physiological parameter influencing benzene's health effects.
  • Further research with larger sample sizes is needed to clarify sex and gender impacts on occupational benzene exposure.
  • Findings highlight the need for sex-specific risk assessments in occupational health.