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Related Concept Videos

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
[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.
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

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Related Experiment Video

Updated: Jun 2, 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

Diterpene lactones with labdane, halimane and clerodane frameworks.

Lúcia Silva1, Arlindo C Gomes, Jesus M L Rodilla

  • 1Department of Chemistry, University of Beira Interior, 6200 - Covilhã, Portugal. luciasilva@ubi.pt

Natural Product Communications
|May 13, 2011
PubMed
Summary

This review covers labdane, halimane, and clerodane diterpenoids, focusing on their lactone derivatives. These compounds exhibit significant insect antifeedant, antiviral, cytotoxic, and trypanocidal biological properties.

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Area of Science:

  • Natural Products Chemistry
  • Organic Chemistry
  • Medicinal Chemistry

Background:

  • Labdane, halimane, and clerodane diterpenoids are naturally occurring compounds found in various plant families.
  • These diterpenoids, particularly those with lactone functionalities, are of significant scientific interest.
  • Their diverse biological activities have been documented, highlighting their potential applications.

Purpose of the Study:

  • To provide a comprehensive review of lactone diterpenoids featuring labdane, halimane, and clerodane frameworks.
  • To consolidate information on the isolation and structural characteristics of these compounds.
  • To summarize the known biological properties and potential applications of these diterpenoids.

Main Methods:

  • Literature review of scientific publications.
  • Systematic search for diterpenoids with labdane, halimane, and clerodane skeletons.
  • Analysis of reported biological activities, including insect antifeedant, antiviral, cytotoxic, and trypanocidal effects.

Main Results:

  • Identification of numerous labdane, halimane, and clerodane diterpenoids with lactone groups.
  • Compilation of their occurrence in different plant families.
  • Summary of their demonstrated bioactivities, emphasizing their pharmacological relevance.

Conclusions:

  • Lactone diterpenoids with labdane, halimane, and clerodane structures represent a rich source of bioactive molecules.
  • These compounds possess a wide spectrum of biological activities, including insect antifeedant, antiviral, cytotoxic, and trypanocidal effects.
  • Further research into these diterpenoids may lead to the development of new therapeutic agents and pest control strategies.