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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Aromatic Compounds: Overview01:25

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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 isolated...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Frost Circles for Different Conjugated Systems01:18

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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.
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Aromaticity and Optical Activity.

Veronica L Murphy1, Adam Reyes1, Bart Kahr1

  • 1Department of Chemistry and Molecular Design Institute, New York University , 100 Washington Square East, Silver Center, Room 1001, New York, New York 10003, United States.

Journal of the American Chemical Society
|December 23, 2015
PubMed
Summary
This summary is machine-generated.

Aromaticity, the stable electron configuration in cyclic molecules, is linked to reduced optical activity. This occurs because electron circulation in aromatic systems uncouples electric and magnetic dipoles, affecting how molecules interact with light.

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Area of Science:

  • Organic Chemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Optical activity is a key property in stereochemistry, crucial for understanding molecular chirality.
  • Aromaticity, defined by Hückel's rule (4n+2 π-electrons), confers unique stability and electronic properties to cyclic molecules.

Purpose of the Study:

  • To investigate the relationship between molecular aromaticity and observed optical activity.
  • To explore how electronic delocalization in aromatic systems influences chiroptical properties.

Main Methods:

  • Comparative analysis of optical activity in various aromatic and non-aromatic molecular systems.
  • Examination of heterocycles, cyclic ketones, tautomers, and partially hydrogenated cycloalkanes.
  • Theoretical exploration of electric dipole-magnetic dipole polarizability contributions.

Main Results:

  • A consistent correlation was observed between aromaticity and diminished optical activity across all studied systems.
  • Aromatic compounds exhibited lower magnitudes of optical rotation compared to their non-aromatic counterparts.
  • Theoretical analysis suggests uncoupling of electric and magnetic dipoles in aromatic systems.

Conclusions:

  • Aromaticity generally leads to a reduction in a molecule's optical activity.
  • The findings provide a basis for predicting structure-optical activity relationships by analyzing molecular structure.
  • Understanding this relationship aids in the design and characterization of chiral molecules.