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Related Concept Videos

[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.
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...
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.
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...
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...
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:

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Five bicyclo[3.3.0]octa-2,6-dienes.

Andrés Vega1, Oscar Donoso-Tauda, Andres Ibañez

  • 1Laboratorio de Recursos Naturales, Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andrés Bello, Av. República 275, Santiago, Chile. andresvega@unab.cl

Acta Crystallographica. Section C, Crystal Structure Communications
|April 9, 2008
PubMed
Summary
This summary is machine-generated.

This study details five bicyclo[3.3.0]octa-2,6-diene compounds, revealing how substitutions alter their butterfly-like conformation and molecular packing. The findings illustrate the relationship between chemical structure and crystal arrangement in this bicyclic system.

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Structural Chemistry

Background:

  • The bicyclo[3.3.0]octa-2,6-diene skeleton is a complex fused ring system.
  • Understanding structure-property relationships in organic molecules is crucial for synthesis and application.
  • Previous studies have explored various bicyclic systems, but systematic analysis of substitution effects on this specific skeleton is limited.

Purpose of the Study:

  • To synthesize and characterize a series of five novel bicyclo[3.3.0]octa-2,6-diene derivatives.
  • To investigate the impact of varying substituents (hydroxy, methoxy, acetoxy, methyl) on the core bicyclic structure.
  • To analyze the conformational changes and molecular packing arrangements influenced by these substitutions.

Main Methods:

  • Synthesis of five tetramethyl bicyclo[3.3.0]octa-2,6-diene derivatives with different substituents at positions 3 and 7.
  • Single-crystal X-ray diffraction analysis to determine the precise three-dimensional structures.
  • Analysis of dihedral angles, intramolecular hydrogen bonding, and intermolecular interactions (C-H...O) to understand packing.

Main Results:

  • Five compounds were successfully synthesized and characterized, featuring methoxycarbonyl groups and varied 3,7-substituents.
  • The bicyclooctadiene system consistently adopts a butterfly-like conformation with non-planar C5 rings.
  • Intramolecular hydrogen bonds were observed in dihydroxy derivatives, while C-H...O interactions dictated packing into dimers or chains.

Conclusions:

  • The study demonstrates how substitutions on the bicyclo[3.3.0]octa-2,6-diene skeleton significantly influence its geometry and conformation.
  • Molecular packing is modulated by these structural changes, primarily through C-H...O interactions, leading to different supramolecular architectures.
  • This series provides valuable insights into the structure-property correlations within substituted bicyclooctadiene systems.