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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Aromatic Hydrocarbon Cations: Structural Overview01:18

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...
Thermal Electrocyclic Reactions: Stereochemistry01:17

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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.
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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 confirmed through isotopic...

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Related Experiment Video

Updated: May 23, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Published on: June 21, 2017

Eucleanal: a new napthalene derivative from Euclea divinorum.

Margaret Mwihaki Ng'ang'a1, Hidayat Hussain, Sumesh Chhabra

  • 1Department of Chemistry, Kenyatta University, P.O. Box 43844-00100 Nairobi, Kenya.

Natural Product Communications
|April 6, 2012
PubMed
Summary
This summary is machine-generated.

A novel naphthalene derivative, eucleanal, was identified from Euclea divinorum. Its chemical structure was confirmed using advanced spectroscopic and mass spectrometry techniques.

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Published on: September 18, 2016

Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Euclea divinorum is a plant species known for its potential medicinal properties.
  • The isolation of new compounds from plant sources contributes to the discovery of novel chemical entities.

Purpose of the Study:

  • To isolate and characterize a new chemical compound from Euclea divinorum.
  • To elucidate the structure of the newly discovered naphthalene derivative.

Main Methods:

  • Isolation of the compound using chromatographic techniques.
  • Structure elucidation employing Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C NMR, COSY, HMQC, HMBC).
  • High-Resolution Electron Ionization Mass Spectrometry (HREIMS) for accurate mass determination.

Main Results:

  • A new naphthalene derivative, designated eucleanal (1), was successfully isolated.
  • The detailed spectroscopic analysis confirmed the unique structure of eucleanal.
  • HREIMS analysis provided the precise molecular formula for the new compound.

Conclusions:

  • Eucleanal is a novel naphthalene derivative isolated from Euclea divinorum.
  • The study successfully elucidated the structure of eucleanal using comprehensive spectroscopic methods.
  • This discovery adds to the known phytochemical constituents of Euclea divinorum.