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Related Concept Videos

Structure and Nomenclature of Epoxides02:38

Structure and Nomenclature of Epoxides

Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...
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Aromatic Hydrocarbon Cations: Structural Overview

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.
Removing one hydrogen from the intervening CH2 group with both...
Cycloalkanes02:28

Cycloalkanes

Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Preparation of Epoxides03:00

Preparation of Epoxides

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...

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(E)-2-(4-Fluoro-benzyl-idene)cyclo-octanone.

Yu-Lin Zhu1, Min Xie, Jie Zheng

  • 1School of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
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Researchers synthesized a novel fluorinated organic compound via aldol condensation. The study details the preparation and conformational analysis of this eight-membered ring structure.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Structural Chemistry

Background:

  • Aldol condensation is a fundamental carbon-carbon bond-forming reaction.
  • Fluorinated organic compounds possess unique properties relevant to various applications.
  • Cyclooctanone and fluorobenzaldehyde are common starting materials in organic synthesis.

Purpose of the Study:

  • To synthesize a novel fluorinated organic compound.
  • To investigate the conformational preferences of the resulting eight-membered ring.
  • To explore the utility of specific catalytic systems in aldol condensation.

Main Methods:

  • Direct aldol condensation reaction between cyclooctanone and 4-fluorobenzaldehyde.
  • Catalysis using a palladium, nickel, and cerium (Pd(Ni,Ce)) system.
  • Inclusion of trimethylsilyl chloride as a reagent.

Main Results:

  • Successful synthesis of the target compound C(15)H(17)FO.
  • Characterization of the compound, confirming its structure.
  • Determination that the eight-membered ring adopts a boat-chair conformation.

Conclusions:

  • The described method provides an efficient route to the target fluorinated compound.
  • The boat-chair conformation is the preferred structure for the eight-membered ring in this molecule.
  • The catalytic system is effective for promoting the aldol condensation.