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Related Concept Videos

Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

11.9K
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...
11.9K
Mass Spectrometry: Aromatic Compound Fragmentation01:23

Mass Spectrometry: Aromatic Compound Fragmentation

2.0K
Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
2.0K
NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

9.2K
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...
9.2K
Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

9.0K
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).
9.0K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.1K
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.
3.1K
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

5.2K
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.
5.2K

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Related Experiment Video

Updated: Oct 14, 2025

Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids BPCA
08:12

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

Published on: May 16, 2016

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Pyrogenic molecular markers: linking PAH with BPCA analysis.

Daniel B Wiedemeier1, Sonja Brodowski2, Guido L B Wiesenberg1

  • 1Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.

Chemosphere
|August 2, 2014
PubMed
Summary

Characterizing pyrogenic organic matter (PyOM) is crucial. Polycyclic aromatic hydrocarbon (PAH) and benzenepolycarboxylic acid (BPCA) analyses are complementary methods for PyOM research, especially with new isotopic techniques.

Keywords:
Aromatic condensationBenzene polycarboxylic acidsBiocharBlack carbonPolycyclic aromatic hydrocarbonsPyrolysis temperature

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Area of Science:

  • Environmental Chemistry
  • Organic Geochemistry
  • Biomass Burning Research

Background:

  • Pyrogenic organic matter (PyOM) is increasing in the environment.
  • Molecular markers like polycyclic aromatic hydrocarbons (PAHs) and benzenepolycarboxylic acids (BPCAs) are used to characterize PyOM.
  • Understanding the relationship between PAH and BPCA methods is essential for accurate PyOM analysis.

Purpose of the Study:

  • To investigate the linkages between PAH and BPCA molecular marker methods for PyOM characterization.
  • To compare results from both methods using controlled charring conditions.
  • To assess the complementarity of PAH and BPCA analyses in PyOM research.

Main Methods:

  • Controlled charring of rye and maize straws at 300, 400, and 500 °C.
  • Analysis of PAHs and BPCAs on lipid extracts and extraction residues.
  • Comparison of molecular data obtained from both analytical techniques.

Main Results:

  • Both PAH and BPCA analyses indicated increased aromatic condensation with higher charring temperatures.
  • A correlation was observed between benzenetricarboxylic acids (B3CAs) and PAH abundance in lipid extracts.
  • The study confirmed the validity and complementary nature of the two analytical approaches.

Conclusions:

  • PAH and BPCA methods provide consistent information on PyOM characteristics, particularly aromaticity.
  • The lipid fraction shows overlap between the two methods, highlighting their interconnectedness.
  • These molecular marker methods, enhanced by isotopic analysis, are vital for future PyOM research.