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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...

Criteria for Aromaticity and the Hückel 4n + 2 Rule

Criteria for Aromaticity and the Hückel 4n + 2 Rule

Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...

Frost Circles for Different Conjugated Systems

Frost Circles for Different Conjugated Systems

The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.

Aromatic Compounds: Overview

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...

Nomenclature of Aromatic Compounds with a Single Substituent

Nomenclature of Aromatic Compounds with a Single Substituent

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).

NMR Spectroscopy of Aromatic Compounds

NMR Spectroscopy of Aromatic Compounds

Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.

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Related Experiment Video

Updated: Feb 20, 2026

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

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

Published on: December 16, 2019

How to evaluate aromaticity under pressure? Benzene as a benchmark system.

Jochen Eeckhoudt¹, Alexander Dellwisch², Annelene Plump²

¹Vrije Universiteit Brussel Pleinlaan 2 Brussels Belgium mercedes.alonso.giner(at)vub.be.

Chemical Science

|February 19, 2026

Summary

This summary is machine-generated.

Investigating aromaticity under hydrostatic pressure reveals complex changes. While structural and electronic measures suggest a slight decrease, magnetic properties indicate enhanced aromaticity, highlighting the need for multiple descriptors.

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Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids BPCA

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Published on: May 16, 2016

Area of Science:

Physical Chemistry
Quantum Chemistry
Computational Chemistry

Background:

Aromaticity is crucial for chemical stability, reactivity, and electronic structure.
Traditional studies of aromaticity are limited to ambient conditions.
Exploring aromaticity under external perturbations like pressure is an emerging research area.

Purpose of the Study:

To investigate the evolution of aromaticity in benzene under hydrostatic pressure.
To evaluate the performance and limitations of aromaticity indices under compression.
To propose refinements for reliable application of aromaticity descriptors under pressure.

Main Methods:

Utilized state-of-the-art quantum chemical methodologies.
Simulated hydrostatic pressure at the single-molecule level.
Systematically analyzed structural, electronic, and magnetic descriptors of aromaticity.

Main Results:

Structural and electronic indices indicated a modest loss of aromaticity under pressure.
Magnetic descriptors suggested an enhanced aromaticity under pressure.
Identified limitations of widely used aromaticity indices under compression.

Conclusions:

Aromaticity exhibits complex behavior under hydrostatic pressure, requiring a multidimensional descriptor framework.
Proposed refinements and guidelines for applying aromaticity indices under compression.
Results offer new insights into the robustness of aromaticity descriptors under extreme conditions.