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Related Concept Videos

Reactions at the Benzylic Position: Oxidation and Reduction00:59

Reactions at the Benzylic Position: Oxidation and Reduction

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The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
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Reactions at the Benzylic Position: Halogenation01:11

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Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
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NMR Spectroscopy of Benzene Derivatives01:34

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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...
11.0K
Preparation of Epoxides03:00

Preparation of Epoxides

9.1K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
9.1K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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5.0K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
5.0K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

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10.8K
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 study details the crystal structure of a coumarin derivative, revealing a significant dihedral angle and intermolecular interactions. These findings contribute to understanding molecular packing in organic crystals.

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centrosymmetric dimercrystal structurehydrogen bondingπ–π stacking

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Coumarin derivatives are known for diverse biological activities.
  • Understanding crystal packing is crucial for material properties.

Purpose of the Study:

  • To elucidate the crystal structure of a specific coumarin derivative (C18H14O4).
  • To analyze intermolecular interactions governing crystal assembly.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Analysis of hydrogen bonding and π-π stacking interactions.

Main Results:

  • The dihedral angle between the coumarin and phenyl groups is 63.46(5)°.
  • Molecules are stabilized by C-H⋯O hydrogen bonds and π-π stacking.
  • A short C=O⋯π contact (3.2667(10) Å) was observed.

Conclusions:

  • The crystal structure is defined by a combination of weak hydrogen bonds and aromatic interactions.
  • The observed structural features provide insights into the solid-state behavior of coumarin compounds.