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Related Concept Videos

Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives

Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes

The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified petroleum gas (LPG), fuel oil, gasoline, diesel fuel, and...
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.

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Related Experiment Video

Updated: Jul 16, 2026

Light-driven Enzymatic Decarboxylation
09:58

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

Thermal decomposition of decalin: an ab initio study.

Kyungchan Chae1, Angela Violi

  • 1Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48109-2125, USA.

The Journal of Organic Chemistry
|March 31, 2007
PubMed
Summary

This study reveals new reaction pathways for decalin breakdown, producing key aromatic compounds like benzene and toluene through carbon-carbon bond cleavage and hydrogen reactions. Kinetic analysis confirms benzene, toluene, and xylene as major products under pyrolytic conditions.

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Last Updated: Jul 16, 2026

Light-driven Enzymatic Decarboxylation
09:58

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Published on: May 22, 2016

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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Measuring Biomolecular DSC Profiles with Thermolabile Ligands to Rapidly Characterize Folding and Binding Interactions
09:15

Measuring Biomolecular DSC Profiles with Thermolabile Ligands to Rapidly Characterize Folding and Binding Interactions

Published on: November 21, 2017

Area of Science:

  • Computational chemistry
  • Chemical kinetics
  • Reaction mechanism studies

Background:

  • Decalin breakdown is crucial for understanding hydrocarbon pyrolysis.
  • Existing models may not fully capture all reaction pathways.
  • Aromatic species are significant products in hydrocarbon decomposition.

Purpose of the Study:

  • To investigate novel reaction mechanisms for decalin breakdown.
  • To identify new pathways leading to monoaromatic species.
  • To compute thermal rate constants for these new pathways.

Main Methods:

  • Density functional theory (DFT) calculations using B3LYP and BH&HLYP functionals.
  • Potential energy surface mapping.
  • Rice-Ramsperger-Kassel-Marcus (RRKM) and transition state theory (TST) for rate constant computation.
  • Kinetic analysis under pyrolytic conditions.

Main Results:

  • Identified new reaction pathways involving carbon-carbon bond cleavage, dissociation, and hydrogen abstraction/addition.
  • Connected decalin to five primary monoaromatic species: benzene, toluene, styrene, ethylbenzene, and xylene.
  • Calculated high-pressure limit thermal rate constants for the elucidated pathways.

Conclusions:

  • Benzene, toluene, and xylene are confirmed as major products of decalin breakdown under pyrolytic conditions.
  • The newly identified pathways contribute significantly to the formation of these aromatics.
  • Computational methods provide valuable insights into complex hydrocarbon pyrolysis mechanisms.