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Related Concept Videos

NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

10.7K
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...
10.7K
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

11.5K
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.
11.5K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

11.7K
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).
11.7K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.6K
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...
5.6K
Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

9.8K
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).
9.8K
Reactions at the Benzylic Position: Oxidation and Reduction00:59

Reactions at the Benzylic Position: Oxidation and Reduction

4.8K
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.
4.8K

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Related Experiment Video

Updated: Jan 2, 2026

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
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Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Published on: December 16, 2019

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[Considerations on the limit values for benzene].

Maria Luisa Scapellato1, Maria Cristina Aprea, Angelo Moretto

  • 1U.O.C. di Medicina del Lavoro, Azienda Ospedaliera di Padova, Università di Padova, Padova, Italy. marialuisa.scapellato@unipd.it

Giornale Italiano Di Medicina Del Lavoro Ed Ergonomia
|December 6, 2013
PubMed
Summary
This summary is machine-generated.

Current occupational exposure limits for benzene in Italy and the EU are outdated. Revising these limits to align with the ALARA principle and modern risk assessment is recommended, incorporating biological monitoring.

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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Area of Science:

  • Environmental Health
  • Occupational Toxicology
  • Regulatory Science

Context:

  • Benzene is a significant environmental pollutant with established EU guideline values for ambient air (5 µg/m³).
  • Occupational benzene exposure levels have decreased significantly, often approaching general population levels.
  • Existing occupational exposure limits (OELs) for benzene in Italy and the EU (1 ppm or 3.2 mg/m³) are being re-evaluated.

Purpose:

  • To compare international benzene OELs and guideline values with current Italian and EU standards.
  • To assess the appropriateness of existing OELs based on carcinogenic risk and technological feasibility.
  • To advocate for updated OELs consistent with the ALARA (As Low As Reasonably Achievable) principle.

Summary:

  • The study reviews proposed occupational exposure limits (OELs) for benzene from international bodies and compares them to existing Italian and EU limits.
  • It highlights that current OELs for benzene (1 ppm or 3.2 mg/m³) are inconsistent with the ALARA principle and not technologically justified, given reduced occupational exposures.
  • The paper suggests that preventive interventions and biological monitoring are crucial for effective risk management beyond mere compliance with outdated limits.

Impact:

  • Recommends revising current Italian and EU occupational exposure limits for benzene to reflect reduced exposure levels and carcinogenic risk.
  • Emphasizes the importance of the ALARA principle and technological feasibility in setting occupational health standards.
  • Promotes the use of biological monitoring to ensure the effectiveness of risk management strategies for benzene exposure.