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Related Concept Videos

Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Pyrolytic hydrocarbon growth from cyclopentadiene.

Do Hyong Kim1, James A Mulholland, Dong Wang

  • 1School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. dr.dohyongkim@gmail.com

The Journal of Physical Chemistry. A
|November 6, 2010
PubMed
Summary

Cyclopentadiene (CPD) forms aromatic hydrocarbons like benzene, indene, and naphthalene via dimerization. This study confirms CPD

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Area of Science:

  • Chemical kinetics
  • Combustion chemistry
  • Organic chemistry

Background:

  • Aromatic hydrocarbons are crucial in combustion and industrial processes.
  • Understanding their formation pathways is essential for controlling reactions.
  • Cyclopentadiene is a key precursor in aromatic hydrocarbon synthesis.

Purpose of the Study:

  • To investigate the formation of aromatic hydrocarbons from cyclopentadiene (CPD) in a high-temperature, oxygen-free environment.
  • To elucidate the dominant reaction pathways and mechanisms involved in CPD-based aromatic growth.
  • To validate computational studies through experimental observations.

Main Methods:

  • Utilized a laminar flow reactor for experiments.
  • Operated within a temperature range of 550-950 °C.
  • Conducted reactions in an oxygen-free atmosphere.

Main Results:

  • Identified benzene, indene, and naphthalene as major products of CPD reactions.
  • Observed a crossover in indene and naphthalene yields around 775 °C, aligning with computational predictions.
  • Detected methylindene and dihydronaphthalene intermediates, supporting CPD dimerization as the primary pathway.
  • Confirmed the significance of CPD in carbon growth through reactions with other aromatics.

Conclusions:

  • CPD dimerization via radical-molecule and/or radical-radical pathways is the dominant route to indene and naphthalene.
  • Experimental results strongly support previous computational findings on CPD reaction mechanisms.
  • CPD plays a vital role in the formation of larger aromatic structures through subsequent reactions.