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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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Introduction
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Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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On pyridine chloronium cations.

Patrick Pröhm1, Willi Berg1, Susanne Margot Rupf1

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Chemical Science
|March 6, 2023
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Summary
This summary is machine-generated.

Researchers provide the first solid-state structural evidence for mono- and bis(pyridine)chloronium cations. This study reveals how pyridine

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Solid-State Chemistry

Background:

  • Chloronium cations are reactive intermediates.
  • Understanding their structure and reactivity is crucial for synthetic chemistry.
  • Pyridine derivatives can influence chlorine's chemical behavior.

Purpose of the Study:

  • To synthesize and characterize novel mono- and bis(pyridine)chloronium cations.
  • To investigate the influence of pyridine substitution on chlorine disproportionation reactions.
  • To provide solid-state structural evidence for these unique chemical species.

Main Methods:

  • Low-temperature synthesis in propionitrile and anhydrous HF.
  • Use of reagents including elemental chlorine, ClF, AsF5, and various pyridine derivatives.
  • Solid-state structural analysis via X-ray crystallography.

Main Results:

  • Successful synthesis and structural confirmation of mono(pyridine)chloronium and bis(pyridine)chloronium cations.
  • Observation of a pyridine-dependent chlorine disproportionation reaction.
  • Electron-rich dimethylpyridine (lutidine) promoted disproportionation to trichloride anions, while pyridine formed a 1:1 adduct.

Conclusions:

  • The study establishes the first solid-state structural evidence for pyridine-stabilized chloronium cations.
  • Pyridine's substitutional pattern dictates the outcome of chlorine disproportionation reactions.
  • These findings offer new insights into the chemistry of halogen cations and adducts.