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Related Concept Videos

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
[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.
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Nomenclature of Primary Amines01:17

Nomenclature of Primary Amines

Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.
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...

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Related Experiment Video

Updated: May 22, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
07:59

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

Three new acyclic diterpenoids from Eupatorium lindleyanum DC.

Shuang-Qing Wu1, Nai-Yu Xu, Jian Zhang

  • 1College of Pharmaceutical Science, Soochow University, Suzhou, 215123, China.

Journal of Asian Natural Products Research
|May 16, 2012
PubMed
Summary

Researchers identified three novel acyclic diterpenoids from the Eupatorium lindleyanum plant. Their chemical structures were determined using advanced nuclear magnetic resonance (NMR) spectroscopic techniques.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Eupatorium lindleyanum DC. is a plant species with potential for novel compound discovery.
  • Acyclic diterpenoids represent a class of natural products with diverse biological activities.

Purpose of the Study:

  • To isolate and characterize new acyclic diterpenoids from Eupatorium lindleyanum DC.
  • To elucidate the chemical structures of these novel compounds.

Main Methods:

  • Isolation of compounds from the whole plant of Eupatorium lindleyanum DC.
  • Structure elucidation using comprehensive spectroscopic analyses, including proton (1H) and carbon-13 (13C) Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Detailed analysis of 2D NMR experiments for structural confirmation.

Main Results:

  • Three new acyclic diterpenoids were successfully isolated from the plant material.
  • The structures of these three compounds were fully elucidated.
  • Nuclear Magnetic Resonance (NMR) data provided definitive structural information.

Conclusions:

  • The study successfully expanded the knowledge of chemical constituents in Eupatorium lindleyanum.
  • The identified compounds represent novel additions to the known acyclic diterpenoids.
  • Advanced NMR techniques are crucial for the characterization of complex natural products.