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Related Concept Videos

IUPAC Nomenclature of Aldehydes01:16

IUPAC Nomenclature of Aldehydes

Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
Radical Substitution: Allylic Bromination01:27

Radical Substitution: Allylic Bromination

In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides01:16

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

Naming Acid Halides
The IUPAC and common names of acid halides are derived from the corresponding carboxylic acids, by changing “ic acid” to “yl halide.” For example, as shown below, the IUPAC name ethanoyl chloride is derived from ethanoic acid, and the common name, acetyl chloride, is obtained from acetic acid.
Structure and Nomenclature of Alcohols and Phenols02:23

Structure and Nomenclature of Alcohols and Phenols

Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and phenols...
NMR Spectroscopy of Benzene Derivatives01:37

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...

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Related Experiment Video

Updated: Jun 5, 2026

Elucidating the Metabolism of 2,4-Dibromophenol in Plants
06:54

Elucidating the Metabolism of 2,4-Dibromophenol in Plants

Published on: February 10, 2023

2,3-Dibromo-3-phenyl-propionic acid.

Pui Yee Thong1, Kong Mun Lo, Seik Weng Ng

  • 1Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Acta Crystallographica. Section E, Structure Reports Online
|January 5, 2011
PubMed
Summary

The crystal structure of C(9)H(8)Br(2)O(2) reveals inversion dimers formed by hydrogen bonds. Molecular disorder was observed, with atoms occupying two positions.

Area of Science:

  • Crystallography
  • Chemical Physics

Background:

  • Understanding molecular interactions and structural properties is crucial in chemical physics.
  • Crystal structure analysis provides insights into intermolecular forces and atomic arrangements.

Purpose of the Study:

  • To determine the crystal structure of the title compound, C(9)H(8)Br(2)O(2).
  • To investigate the presence of hydrogen bonding and molecular disorder within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to analyze the crystal structure.
  • The crystal structure was solved and refined to identify atomic positions and bonding.

Main Results:

  • The crystal structure exhibits inversion dimers connected by two O-H⋯O hydrogen bonds.

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

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Last Updated: Jun 5, 2026

Elucidating the Metabolism of 2,4-Dibromophenol in Plants
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Elucidating the Metabolism of 2,4-Dibromophenol in Plants

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
08:46

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

  • Significant molecular disorder was identified, with carbon and oxygen atoms distributed over two sites in a 2:1 ratio.

    • Conclusions:

    • The study elucidates the supramolecular architecture of C(9)H(8)Br(2)O(2), highlighting the role of hydrogen bonding.
    • The observed atomic disorder provides valuable information for understanding crystal packing and dynamics.